All summary tags should be removed from existing JSDoc.

[herregroen]

The WordPress javascript documentation standards were recently changed in how to deal with short and long descriptions.

This includes no longer using the @summary tag. Instead a doc block should start with a short description and, optionally, include a longer description separated by an empty line.

[netweb]

Reviewed, this is good to go in 👍🏼

[herregroen]

Updated patch to be compatible with newest trunk.

[atimmer]

In 42411:

Docs: Remove @summary tags from JSDoc.

As decided in the JavaScript core chat. With a few reasons:

• It is visually cleaner when reading the source.
• This bring the JavaScript documentation closer to the PHP documentation.

The only disadvantage is that the JSDoc parser doesn't split out the summary and the description in the new format. We've decided to solve this when building the JavaScript documentation parser.

Props herregroen.
Fixes #42901.