chore(vendors): Updated and minified jQuery Form

Upgraded jQuery Form to 3.50.

Fixes #6601
Merge pull request #6607 from sembrestels/vendors-jquery-form-min

chore(vendors): Updated and minified jQuery Form
fix(docs): fix a couple of typos
Merge pull request #6674 from beck24/docs-typos

fix(docs): fix a couple of typos
Merge github.com:Elgg/Elgg