corporate: Correct apostrophe directions.

Signed-off-by: Anders Kaseorg <anders@zulip.com>

CODE_OF_CONDUCT.md

@@ -166,7 +166,7 @@ Here are some guidelines for you how can help:
 
 - Try to assume the best intentions from others (given the range of
   possibilities presented by their visible behavior), and stick with a friendly
-  and positive tone even when someone‘s behavior is poor or disrespectful.
+  and positive tone even when someone’s behavior is poor or disrespectful.
   Everyone has bad days and stressful situations that can result in them
   behaving not their best, and while we should be firm about our community
   rules, we should also enforce them with kindness.

templates/corporate/case-studies/end-point-case-study.md

@@ -52,7 +52,7 @@ explored all the leading open-source team chat products. They found that while
 Mattermost and Rocket.Chat were similar to Slack (but felt less polished), Zulip
 stood out. “Zulip had all the modern features we were looking for, like
 reliable, flexible notifications. At the same time, the [extensive keyboard
-shortcuts](/help/keyboard-shortcuts) and the ‘All messages‘
+shortcuts](/help/keyboard-shortcuts) and the ‘All messages’
 view offered a UI that the IRC fans loved.”
 
 When End Point moved to Zulip, it was an immediate improvement over the

templates/corporate/development-community.md

@@ -70,7 +70,7 @@ feedback.
   possible for others to benefit from the discussion.
 - Don’t ask the same question in multiple places. Moderators read
   every public stream, and make sure every question gets a reply.
-- Use @-mentions sparingly. Unlike IRC or Slack, Zulip‘s topics make
+- Use @-mentions sparingly. Unlike IRC or Slack, Zulip’s topics make
   it easy to see what you’re replying to, so you don’t need to mention
   your conversation partner to make sure they will see or understand
   your reply. Core contributors will often @-mention someone who asked