help-documentation: Fix typos in help documentation.

Fixes #2639

templates/zerver/help/format-your-message-using-markdown.md

@@ -82,7 +82,7 @@ Typing `@**all**` will alert all users in the stream, and a confirmation message
 
 ![Mention All](/static/images/help/all-confirm.png)
 
-For more information on mentions, visit [here](/help/mention-a-team-member.md) for more information.
+For more information on mentions, visit [here](/help/mention-a-team-member) for more information.
 
 ## Code
 

templates/zerver/help/index.md

@@ -129,7 +129,7 @@ as a “**realm**”.
 - **[Other common questions](#other-common-questions)**
 - **[Signing out](signing-out)**
 - **[Terminology](#special-terms-used-with-zulip)**
-- **[Zulip glossary](/help/glossary.md)**
+- **[Zulip glossary](/help/glossary)**
 
 ---
 
@@ -161,9 +161,9 @@ There are three panes in your browser window.
 ## Posting and replying
 
 **[… To a stream](#posting-and-replying-to-a-stream)** |
-**[… To individual users](#posting-and-replying-to-individual-users)** |
+**[… To individual users](#posting-and-replying-to-individual-users-pm-private-message)** |
 **[Some facts about messages](#some-facts-about-messages)** |
-**[Editing past messages](editing-past-messages.md)**
+**[Editing past messages](editing-past-messages)**
 
 At the bottom of your screen, choose whether to post to a stream or to
 individual users. ![New message](/static/images/help/new_message.png)
@@ -254,8 +254,8 @@ individual users. ![New message](/static/images/help/new_message.png)
 ## Other common questions
 
 **[Keyboard shortcuts](#keyboard-shortcuts)** |
-**[Searching](search-messages.md)** |
+**[Searching](search-messages)** |
-**[Filtering](search-messages.md#filtering-messages)** |
+**[Filtering](search-messages#filtering-messages)** |
 **[Date of a message](#date-of-a-message)** |
 **[Change topic title or stream name](#changing-the-title-of-a-topic-or-stream)** |
 **[Edit topic titles](#editing-a-topic-title)** |
@@ -348,7 +348,7 @@ organization. But here are some thoughts:
 
 As long you have contributed a message to some topic, you can edit the
 topic title. Go to one of your own messages in that topic and follow
-**[the instructions for editing it](#editing-past-messages)**. Notice
+**[the instructions for editing it](editing-past-messages)**. Notice
 that the topic title is now editable, too. You will be offered the
 chance to change the topic in one of three ways:
 

templates/zerver/help/streams-and-private-messages.md

@@ -72,7 +72,7 @@ While the file is uploading, a blue box labeled **Uploading...** will appear, an
 
 ![Message formatting modal](/static/images/help/message-formatting-summary.png)
 
-Clicking the **A**  (![A](/static/images/help/formatting.png)) icon will reveal a modal window with a summary of message formatting in Zulip. For more information on message formatting, see our [message formatting guide](/help/message-formatting.md).
+Clicking the **A**  (![A](/static/images/help/formatting.png)) icon will reveal a modal window with a summary of message formatting in Zulip. For more information on message formatting, see our [message formatting guide](/help/message-formatting).
 
 ### Restore draft
 

templates/zerver/help/upload-and-share-files.md

@@ -3,7 +3,7 @@
 Zulip allows you to easily attach files, including images, sound, and video by:
 
 - *Clicking the Paperclip Icon* Use the paperclip icon (![paperclip](/static/images/help/paperclip.png)) located under the message field.
-- *Dragging* You may also drag and drop files on the message field. The files are uploaded to a server and a link is supplied, but a thumbnail is displayed if possible. The link to the file will be in Markdown format: [link_text](link_URL)
+- *Dragging* You may also drag and drop files on the message field. The files are uploaded to a server and a link is supplied, but a thumbnail is displayed if possible. The link to the file will be in Markdown format: `[link_text](link_URL)`
 
 ![before](/static/images/help/file_upload_before.png)