Add help text explaining that --skip and --exact are covered by filter expressions

[sunshowers]

No description provided.

[KaranLMungra]

hey @sunshowers can you describe the --skip and --exact args in more details.

[sunshowers]

Hi @KaranLMungra -- the options basically should mirror what cargo test -- --skip and --exact does, and I'd use those as a reference. However, I'd hold off on doing these as they're probably covered by #117 (and the impl should probably just translate such requests into expressions).

[sunshowers]

I think this use case is sufficiently covered by #117:

• --skip foo is -E '!test(foo)'
• --exact foo is -E 'test(=foo)'

These flags also become really hard to reconcile with filter expressions in general.

I'll leave this open until filter expressions are no longer experimental. We may also want to add help text explaining that --skip and --exact are covered by filter expressions instead.