Fix proper name capitalization

doc/development/secure_coding_guidelines.md

@@ -84,7 +84,7 @@ This Ruby Regex specialty can have security impact, as often regular expressions
 
 GitLab specific examples can be found [here](https://gitlab.com/gitlab-org/gitlab/-/issues/36029#note_251262187) and [there](https://gitlab.com/gitlab-org/gitlab/-/issues/33569).
 
-Another example would be this fictional Ruby On Rails controller:
+Another example would be this fictional Ruby on Rails controller:
 
 ```ruby
 class PingController < ApplicationController