Fix comment typo in debugger.rb
Fixes simple missprint in docs for #cyle in text_helper
Merge pull request #18263 from mntj/fix_typo_in_comment

Fix comment typo in debugger.rb [ci skip]
Merge pull request #18262 from benwoody/fix-cycle-doc-missprint

Fixes simple missprint in docs for #cyle in text_helper [ci skip]
Move Engines guide under Extending Rails [ci skip]