Update stale documentation for axis titles (#9683)

Update stale documentation for axis titles (#9683)

* Update stale documentation for axis titles (#9682)

Updated the documentation for the types on axis labels.

In the corresponding `index.esm.d.ts` file, put JSDoc descriptions for
the properties to match the now-updated documentation.

* Clean up axis title labels documentation (#9682)

Inserted extra information in the documentation for the type of the
padding, inserted missing full stops.

In the type file, added JSDoc for undocumented properties.

* Update docs/axes/labelling.md

* Update types/index.esm.d.ts

Co-authored-by: Jukka Kurkela <jukka.kurkela@gmail.com>