Expand on the phrase no commits needed for try-repo command

[jaredkoontz]

I think this language should be improved.

When I read it, I assumed this meant that you could just git init a repo and start developing a plug-in. It seems however, that pre-commit expects there to be a commit on the repo after discussions here:
pre-commit/pre-commit#3441

[asottile]

the original language is fine: in order for something to be tracked it has to have been committed

[jaredkoontz]

as an end user, i read what is currently written: a commit is not necessary to `try-repo` on a local directory.

that leads me to believe when running try-repo, a commit is not necessary. One can interpret the phrase a commit is not necessary to `try-repo` on a local directory. as create a git directory, throw in the .pre-commit-hooks.yml and start plugging away, which i did.

[asottile]

sure if you stop reading there yes it could be misleading. but that's why there's more words afterwards