Formatting fix in AS changelog [ci skip]
Revert "Formatting fix in AS changelog [ci skip]"

This reverts commit cede0363830e28e73feafc662eccae7d1db526bb.

Reason: CHANGELOG should not be updated on docrails
[ci skip] Add missing colon and period in initialization.md.
Add missing period in Getting Started guide

Within section 5.10 Adding Some Validation
Update the levenshtein distance method in guides.
Merge pull request #15954 from roryokane/getting-started-guide-add-period

Add missing period in Getting Started guide
Merge pull request #15955 from JuanitoFatas/levenshtein-guide

Update the levenshtein distance method in guides.
[Postgresql tests] remove duplicate helper
Merge branch 'master' of github.com:rails/docrails
Merge pull request #15957 from seuros/duplicate

[Postgresql tests] remove duplicate helper
Add punctuation and fix capitalization in Getting Started guide

Fix more small grammar mistakes in the [Getting Started guide](http://edgeguides.rubyonrails.org/getting_started.html#security), in sections 9 and 10.

Specifically, within sections 9.1 “Basic Authentication”, 9.2 “Other Security Considerations”, and 10 “What's Next?”.

“Rails Guides” is generally capitalized on the site, including on the linked page and in the title of the site, so I capitalized it.

“The” is not part of the name of the Ruby on Rails Security Guide – “The” is not in the title on that page.

And I added a missing period and a missing colon at the ends of two sentences.
[ci skip] Fix router option reference in 4.2 release notes.
Merge pull request #15964 from JuanitoFatas/doc/patch-01

[ci skip] Fix router option reference in 4.2 release notes.
Merge pull request #15963 from roryokane/getting-started-guide-fix-grammar

Add punctuation and fix capitalization in Getting Started guide