docs: Update `docs/outreach/` files to use channel.

Updates descriptive text that refer to Zulip channels in the
`docs/outreach` files to use channel instead of stream.

Part of the stream to channel rename project.

docs/outreach/apply.md

@@ -66,7 +66,7 @@ We recommend taking the following steps before diving into the issue tracker:
 
 - Join the [Zulip development
   community](https://zulip.com/development-community/), and introduce yourself
-  in the stream for the program you are participating in
+  in the channel for the program you are participating in
   ([#GSoC](https://chat.zulip.org/#narrow/stream/14-GSoC) or
   [#Outreachy](https://chat.zulip.org/#narrow/stream/391-Outreachy)). Before you
   jump in, be sure to review the [Zulip community
@@ -181,7 +181,7 @@ give you feedback and help you improve your proposal.
   context.
 
 - Please post a link to your draft in the Zulip development community
-  stream dedicated to your program (e.g.,
+  channel dedicated to your program (e.g.,
   [#GSoC](https://chat.zulip.org/#narrow/stream/14-GSoC) or
   [#Outreachy](https://chat.zulip.org/#narrow/stream/391-Outreachy)). Use
   `Your name - project proposal` as the topic.

docs/outreach/experience.md

@@ -53,7 +53,7 @@ mentorship program will:
 - Receive lots of feedback and mentorship from others in the Zulip development
   community, in code reviews on pull requests, and by posting
   [questions](../contributing/asking-great-questions.md) and ideas in public
-  streams.
+  channels.
 
 Mentors and contributors should stay in close contact. We recommend setting up a
 weekly check-in call to make sure you stay on track and have a regular
@@ -80,9 +80,9 @@ to get a feel for what they are working on and share ideas!
 ### Getting feedback and advice
 
 We strongly encourage all Zulip contributors to post their questions and ideas
-in public streams in the [Zulip development
+in public channels in the [Zulip development
 community](https://zulip.com/development-community/). When you post in a public
-stream, you give everyone the opportunity to help you out, and to learn from
+channel, you give everyone the opportunity to help you out, and to learn from
 reading the discussion.
 
 Examples of topics you might ask about include:
@@ -104,7 +104,7 @@ to ask your questions effectively.
 A check-in is a regular update that you post in the Zulip development community.
 You can find many examples in the
 [#checkins](https://chat.zulip.org/#narrow/stream/65-checkins) and
-[#GSoC](https://chat.zulip.org/#narrow/stream/14-GSoC) streams.
+[#GSoC](https://chat.zulip.org/#narrow/stream/14-GSoC) channels.
 
 - **Frequency**: _Regular check-ins are a required for all program
   participants._ If you are working 20+ hours per week, post a check-in at least
@@ -112,7 +112,7 @@ You can find many examples in the
   per week, post a check-in at least once a week.
 
 - **Where to post**: Unless your mentor or program administrator requests
-  otherwise, post your check-ins in the stream for your program
+  otherwise, post your check-ins in the channel for your program
   (e.g., [#GSoC](https://chat.zulip.org/#narrow/stream/14-GSoC) or
   [#Outreachy](https://chat.zulip.org/#narrow/stream/391-Outreachy)), using your
   name as the topic.
@@ -136,9 +136,9 @@ You can find many examples in the
     separate message to make it convenient to quote-and-reply to address it.
     Note that discussions about your work will happen in all the usual places
     (#**frontend**, #**backend**, #**design**, etc.), and those are the
-    streams where you should be _starting_ conversations. Your check-ins are a
+    channels where you should be _starting_ conversations. Your check-ins are a
     place to point out where you're feeling stuck, e.g., there was some
-    discussion in a stream or on GitHub, but it seems to have petered out
+    discussion in a channel or on GitHub, but it seems to have petered out
     without getting to a decision, and you aren't sure what to do.
 
   - What you've been **actively working** on since your last check-in.

docs/outreach/gsoc.md

@@ -160,7 +160,7 @@ Django, TypeScript/JavaScript, and CSS.
   open-source projects. Much of the basic design, API structure, and scaffolding
   is complete, but there is a lot of work that remains to complete this vision.
   The project can likely support a couple students; there is considerable work
-  to be done on the settings UI, both for user groups and for stream and
+  to be done on the settings UI, both for user groups and for channel and
   organization-level settings, dozens of existing settings to migrate, and [many
   new settings][organization-settings-label] that users have long requested that
   we've delayed adding in order to avoid having to migrate them. 175 or 350
@@ -171,19 +171,19 @@ Django, TypeScript/JavaScript, and CSS.
   Experts: Sahil Batra
 
 - Improve the framework and UI in **Zulip's overlays for managing
-  streams and groups**. These two components have very parallel design
+  channels and groups**. These two components have very parallel design
   patterns and implementations (the groups one is quite new!). Coupled
   with the user groups permissions migration, the goal of this project
   is to make these important settings panels ergonomic for the large
   number of new settings that we expect to migrate or add via the
   groups migration. See the [user groups
-  settings][group-settings-issues] and [stream
-  settings][stream-settings-issues] area labels for starter projects.
+  settings][group-settings-issues] and [channel
+  settings][channel-settings-issues] area labels for starter projects.
 
   Experts: Purushottam Tiwari, Sahil Batra
 
 [group-settings-issues]: https://github.com/zulip/zulip/issues?q=is%3Aissue+is%3Aopen+label%3A%22area%3A+settings+%28user+groups%29%22
-[stream-settings-issues]: https://github.com/zulip/zulip/issues?q=is%3Aopen+is%3Aissue+label%3A%22area%3A+stream+settings%22
+[channel-settings-issues]: https://github.com/zulip/zulip/issues?q=is%3Aopen+is%3Aissue+label%3A%22area%3A+stream+settings%22
 [user-group-permissions]: https://github.com/zulip/zulip/issues/19525
 [organization-settings-label]: https://github.com/zulip/zulip/issues?q=is%3Aopen+is%3Aissue+label%3A%22area%3A+settings+%28admin%2Forg%29%22
 

docs/outreach/overview.md

@@ -48,7 +48,7 @@ participants.
 Zulip operates under a **group mentorship** model. While you will have an
 assigned mentor, you will also get lots of feedback from other members of the
 [Zulip development community](https://zulip.com/development-community/) by
-posting your questions and ideas in public streams. We encourage outreach
+posting your questions and ideas in public channels. We encourage outreach
 program participants to help each other out as well!
 
 Program participants work on a variety of issues in their areas of interest,