I would like to fix some documentation issues

[Jason Yip via bug-lilypond]

Hi, I'm following the steps listed at https://lilypond.org/doc/v2.25/Documentation/contributor/introduction-to-issues to get started.

My gitlab id: ljyip

Thanks!

- Jason Yip

OpenPGP_0xB69A3DD87D22F506.asc
Description: OpenPGP public key

OpenPGP_signature
Description: OpenPGP digital signature