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