Fix typo.
add missing 's' for plural.
minor #3801 [Cookbook][Form] Fixed Typo & missing word. (ahsio)

This PR was merged into the 2.3 branch.

Discussion
----------

[Cookbook][Form] Fixed Typo & missing word.

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | all (or 2.3+)
| Fixed tickets |

Commits
-------

cc0846b add missing 's' for plural.
b140a70 Fix typo.
Merge remote-tracking branch 'origin/2.3' into 2.3