runtime(doc): Normalise formatting of builtin function descriptions

- Column align tags
- Move tags to the same line as the function signature
- Move descriptions to the line below the function signature
- Add missing hyperlinks to builtins in the description text

closes: #18478

Signed-off-by: Doug Kearns <[email protected]>
Signed-off-by: Christian Brabandt <[email protected]>

Author: dkearns