fix doc url in milestones

[ci skip]
fix doc url in pull requests

[ci skip]
fix doc url in repositories

[ci skip]
fix doc url in downloads

[ci skip]
fix doc url in repositories

[ci skip]
fix doc url in releases

[ci skip]
fix doc urls in users

[ci skip]
fix doc urls in organizations

[ci skip]
fix doc url in rate_limit

[ci skip]
fix doc example in objects

[ci skip]
add doc url in events

[ci skip]
Merge pull request #369 from joeyw/doc-fixes

docs docs docs