Merge pull request rails#50614 from sato11/fix-typo-engine

Author: vipulnsward

guides/source/api_documentation_guidelines.md

@@ -112,7 +112,7 @@ When referencing a "Rails application", as opposed to an "engine" or "plugin", a
 
 # GOOD
 # Production applications can report their status upstream.
-# Devise is a Rails authentication enging.
+# Devise is a Rails authentication engine.
 ```
 
 Spell software names correctly. When in doubt, please have a look at some authoritative source like their official documentation.