Change zero documentation mentions of genre to genres (#5486)

I've spent 2 hours troubleshooting why none of my music had genre tag.
It was because the single `genre`, without `s` doesn't seem to cover any
good ganre tags... at least it didn't on my opus files

looking at the code:
7ecd86101e/mediafile.py (L1669-L2167)
i don't honestly know why anyone created the single `ganre` field in the
first place
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Šarūnas Nejus 2024-12-02 02:21:08 +00:00 committed by GitHub
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@ -36,9 +36,10 @@ fields to nullify and the conditions for nullifying them:
For example::
zero:
fields: month day genre comments
fields: month day genre genres comments
comments: [EAC, LAME, from.+collection, 'ripped by']
genre: [rnb, 'power metal']
genres: [rnb, 'power metal']
update_database: true
If a custom pattern is not defined for a given field, the field will be nulled
@ -60,4 +61,4 @@ art from files' tags unless you tell it not to. To keep the album art, include
the special field ``images`` in the list. For example::
zero:
keep_fields: title artist album year track genre images
keep_fields: title artist album year track genre genres images