Fix article for generator name

Use 'some' instead of 'a/an'.
active_record: Quote numeric values compared to string columns.
Merge pull request #9207 from dylanahsmith/mysql-quote-numeric

active_record: Quote numeric values compared to string columns.
Merge pull request #9185 from tricknotes/fix-article-for-generator-name

Fix article for generator name
Change behaviour with empty hash in where clause
Merge pull request #9220 from robertomiranda/where-with-empty-hash

Active Record: Change behaviour with empty hash in where clause
Change behaviour with empty array in where clause
Merge pull request #9216 from robertomiranda/where-with-empty-array

Activer Record:  Change behaviour with empty array in where clause
Improve changelog entries in AR

Describe better the changes related to raising errors with empty
array/hash values in where clauses.

[ci skip]
Fix #9168 Initialize NullCookieJar with all options needed for KeyGenerator
Reverting 16f6f25 (Change behaviour with empty array in where clause)
Bump rack dependency to 1.5.2
Merge pull request #9196 from AndreyChernyh/fix-cookies-with-null-session

Fix #9168 Initialize NullCookieJar with all options needed for KeyGenerator
We don't need a CHANGELOG entry for an issue of something that was not released yet
Reverting e170014113 (Change behaviour with empty hash in where clause)
Add missing require to AP