doc: trim GitHub template comments

[Trott]

Checklist

• tests and code linting passes
• the commit message follows commit guidelines

Affected core subsystem(s)

doc

Description of change

Make the comments in the GitHub templates slightly more concise.

/cc @indutny

[mscdex]

What about capitalizing the field names here to match the actual content (and to make them stand out better)?

[Trott]

@mscdex Good idea. Done.

[jbergstroem]

LGTM

[bnoordhuis]

While you're here: "Run the test suite with:" and "on UNIX"?

[Fishrock123]

make test already includes lint. make -j4 test

[Trott]

While you're here: "Run the test suite with:" and "on UNIX"?

Done and done.

[Trott]

make test already includes lint. make -j4 test

lint removed

[bnoordhuis]

LGTM with a suggestion.

[Fishrock123]

Can we get rid of the blank lines between the headings and the comments?

### thing
<!-- description -->

[jasnell]

Rubber stamp LGTM.

[Trott]

Can we get rid of the blank lines between the headings and the comments?

We sure can! Done!

[rvagg]

lgtm
trim trim trim
the less text the more chance it'll be read

The last para is horribly verbose, mostly redundant and simply sounds like someone's trying too hard to be nice and unfortunately it becomes long enough that it's likely to be left unread by many.

It will be much easier for us to fix the issue if a test case that reproduces the problem is provided. Ideally this test case should not have any external dependencies. We understand that it is not always possible to reduce your code to a small test case, but we would appreciate to have as much data as possible.

[I'd rather remove it, but] it could become something like:

If possible, please provide a test case to reproduce the problem, keep it simple so we can run it.

I'd love to see data on whether any of the text in these templates has changed behaviour at all. It's probably an unreasonable request but I'm highly skeptical that we're getting much value out of these and it's just contributing to the noise and raising barriers to entry.

[Fishrock123]

@rvagg We do actually usually find these at least attempted to be filled in as far as I have seen..

I think we should minimize the language and make it as concise as possible but I think keeping it is also a good idea.

[jasnell]

Still LGTM. Would love it if we can find ways of trimming more.

[Trott]

Landed in 42ede93