Fix LineLength for tags in doc blocs

Problem/Motivation

Part of #2572709: [meta] Fix 'Drupal.Files.LineLength' coding standard

Steps to reproduce

Proposed resolution

Wrap the description for tags in doc blocs at 80 characters.

It is not possible to enforce this with a change to phpcs.xml.dist

Remaining tasks

User interface changes

Introduced terminology

API changes

Data model changes

Release notes snippet