Revert "Changed the CHANGELOG for active_support and improved the doc for inflector method classify"

This reverts commit 8d5fcb691e7496900f1c77dff8d6e729c1b56201.

Reason: Changelogs are not to be edited in docrails.

[ci skip]
Revert "Corrected documentation and added some more for the classify method in inflectors"

This reverts commit 8f901dee9e2072dd20e0a252a89dd501d783d85b.
copy edits[ci skip]