Document a difference between pluck and select [ci skip]

Explain that `pluck` differs from `select` in that it does not construct `ActiveRecord` objects and thus model-level overrides are unavailable.
Fix method name typos
Merge pull request #12130 from egilburg/patch-1

Document a difference between pluck and select [ci skip]
Merge pull request #12139 from vipulnsward/typos_av

Fix method name typos
fix actionview and activemodel test cases typos
Merge pull request #12143 from rajcybage/fixing_typos

fix actionview and activemodel test cases typos
push constant lookup in the a cache object
only construct the FixtureSet with AR models
push logic outside the FixtureSet constructor
no need to dup