Fix typos plus minor tweaks

[salim-b]

No description provided.

[krlmlr]

Thanks. The "be able to" might seem redundant, and we need to update the .Rd files?

[salim-b]

The "be able to" might seem redundant

I added this because it's optional that the user supplies a tidyselect specification when wrapping the function argument in double braces ({{ arg }}); arg could still be a "regular" symbol or vector, right?

and we need to update the .Rd files

You want me to add this to this PR? Or do you use some GH action for this anyways?

[krlmlr]

I'm not sure, I'm not a native speaker.

There are other PRs without .Rd updates, it's fine.

[DavisVaughan]

Thanks!