chore(package): fix some warnings/errors

Related to #14952. Fixed the following warnings/errors:

1. **Warning**: Closure Compiler complained about `/* @this */` (annotations in non-JSDoc comments).
   Fixed by changing `/* @this */` to `/** @this */`.

2. **Warning**: Dgeni complained about `/** @this */` (invalid tags found).
   Fixed by adding an empty `this` tag definition in `docs/config/tag-defs/`.

3. **Error**: ESLint complained about CRLF linebreaks in `build/docs/examples/`. These are generated
   by dgeni and (apparently) use the system's default linebreak (e.g. CRLF on Windows).
   Fixed by disabling the `linebreak-style` rule for `build/docs/examples/`.

Closes #14997