[Reference][Form Types] Add missing docs for "action" and "method" option
Improve descriptions
Fixes after review
Update "method" description
Improvements after review
Update note wording for "method" option
Add note about the PATCH method
feature #3436 [Reference][Form Types] Add missing docs for "action" and "method" option (bicpi)

This PR was merged into the 2.3 branch.

Discussion
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[Reference][Form Types] Add missing docs for "action" and "method" option

| Q             | A
| ------------- | ---
| Doc fix?      | no
| New docs?     | yes
| Applies to    | 2.3+
| Fixed tickets | #3410

I'm not sure of adding these two options as separate rst-files because I don't think they will get listed as `inherited` options. But no other options are embedded directly. Please let me know if I can improve that.

Commits
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793c8a0 Add note about the PATCH method
4555495 Update note wording for "method" option
70ca6da Improvements after review
cecc762 Update "method" description
a636945 Fixes after review
83ff4b1 Improve descriptions
1bf3ce0 [Reference][Form Types] Add missing docs for "action" and "method" option