docs: remove broken markdown links (#9822)

chore: remove broken markdown links to documentation

Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>

packages/docgen/README.md

@@ -17,7 +17,6 @@
 ## Links
 
 - [Website][website] ([source][website-source])
-- [Documentation][documentation]
 - [Guide][guide] ([source][guide-source])
   Also see the v13 to v14 [Update Guide][guide-update], which includes updated and removed items from the library.
 - [discord.js Discord server][discord]
@@ -28,8 +27,7 @@
 
 ## Contributing
 
-Before creating an issue, please ensure that it hasn't already been reported/suggested, and double-check the
-[documentation][documentation].  
+Before creating an issue, please ensure that it hasn't already been reported/suggested.  
 See [the contribution guide][contributing] if you'd like to submit a PR.
 
 ## Help