Remove instructions for downloading a module or theme using the Update...

Remove instructions for downloading a module or theme using the Update Manager UI and make Composer the primary/recommended method.

Closes #3468377

Some copy edit suggestions and typo-fixes.

requested changes

added 1 commit

• af038d9b - Copy edits by Amber.

Compare with previous version

added 1 commit

• e0bf3436 - Copy edits suggested by @amberhimesmatz.

Compare with previous version

resolved all threads

changed title from Remomve instructions for downloading a module or theme using the Update... to Remove instructions for downloading a module or theme using the Update...

changed the description

added 1 commit

• 31da3ec1 - Remove instructions about using the Update Manager UI to apply module and...

Compare with previous version