Update p5 sound documentation information

[Dmkk01]

Changes:

• Mostly adding a capital letter to the start of the sentence.

• Adding some extra information to params and/or return values.

• Remove additional 'optional' texts

• Remove repeated words in the same sentence

• [x] npm run lint passes

• [x] [Inline documentation] is included / updated

• [x] [Unit tests] are included / updated