Minor code style and typo fixes

[AneesHl]

I fixed few minor things that my IDE was complaining about.

[lhstrh]

Your IDE seems to care a lot about grammar!

[lhstrh]

This looks a little weird. Also, I'm not sure I understand what's left to do.

[oowekyala]

The idea was to make the parallel-runtime feature a default feature of the crate. Currently if you want parallel execution you need to enable it explicitly with a lot of ceremony: https://github.com/lf-lang/lingua-franca/blob/4f8d8893574e3c76fd30c2515c9be9a7444e4f1f/test/Rust/src/target/CargoDependencyOnRuntime.lf#L5

[oowekyala]

Looks like we have a couple of build issues:

• Pushing docs to the repo fails: https://github.com/lf-lang/reactor-rs/actions/runs/9092232758/job/24988503067?pr=48#step:9:235

/usr/bin/git push origin gh_pages
remote: Permission to lf-lang/reactor-rs.git denied to github-actions[bot].
fatal: unable to access 'https://github.com/lf-lang/reactor-rs.git/': The requested URL returned error: 403

• Running lf-tests doesn't work, AFAICT because the source branch of this PR is in Anees' fork and not in the main repo. Then it fails while fetching the branch, because only the upstream remote is known.