Fixed typo [ci skip]

singular is more suited to
change to "check out"
e-mail => email, and subject/verb agreement
add punctuation
Remove duplicate configuration option for ActiveSupport [ci skip]

Fixes rails/rails#13732
`requies` => `requires`
`easiy` => `easy`
`framwork` => `framework`
Remove old comments about suppressing warnings.
Fixed spelling error: `extracetd` => `extracted`
Add missing test for response destructuring.
Prevent [response].flatten from recursing infinitely.

Returning `self` from within the array returned by `to_ary`
caused this. Instead, we can just substitute another object.
It provides the `each` behavior required by the rack spec.
Fix grammar of internal comment and modify it's location
Specify what #starts_with? we're talking about. Also added a note what
kind of exception we should expect for this internal comment.
docs, link MySQL manual for multi column indexes. [ci ckip].

Closes #9131.
Use full-length version of multiple from c7abc51
adds a section about booleans in the API guidelines [ci skip]
Fixed a grammatical error in Booleans section of API documentation guide
from e1e17a5
move alias method `sanitize_conditions` to a correct place
add activerecord test coverage for `sanitize_sql_array`

check it is handles empty statement