Update Extend page descriptions

Problem/Motivation

The description of a module on the Extend page, describes what the module does.
The module descriptions on the Extend page should follow the common format, as described in the Help text standard.

Proposed resolution

Change the module descriptions in the modules .info.yml files so that they are correct, consistent, and follow the same format.

Remaining tasks

• Compare the module description text of each module with its help text. The help texts have already been reviewed and generally the beginning of the About section provides a good wording of what the module does.
• Check the format of the description text. Does it
• start with a verb, third-person singular (Does, Provides, etc.);
• is it short and concise;
• does it end with a full stop (.)?

User interface changes

This is a UI text change.

API changes

None.

Data model changes

None.