github idea for autoclosing sequences encountered in OP

[Chris Smith]

Something that would be a nice addition to github is an autolink for any autoclosing syntax. For example if I say "I don't think this will fix #123" the word "fix" would become a link (just as the #123 becomes a link) but the "fix-link" would link to a page that says, 

```

Using an autoclosing keyword before an issue or PR number will cause that issue/PR to be closed when this PR is merged. If this is not your intent, insert the word "issue" before the issue number. See [here](https://help.github.com/articles/closing-issues-using-keywords/) for more details.

```

Does anyone else see merit in this?

/c

[Aaron Meurer]

GitHub already does something like this (without the link) for
duplicate issue. See for instance
https://github.com/sympy/sympy/issues/13556#issuecomment-341198018.

Aaron Meurer

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[Chris Smith]

Upon closer inspection I see that there *IS* a highlighting of the closing text. 

This confirms, too, that the following are valid close sequences 

(and the detected closing word is underlined with a dotted line):

fixes #12345

fixes: #12345

This PR fixes #12345

This PR does not fix #12345 (oops! fix is followed by an issue number so the issue will be closed)

The following do NOT close #12345 and the 

fixes- #12345 (intervening '-' makes it invalid)

fixes #1, #12345 (closes #1 but not #12345)

fixes 12345 (no # before the 12345)

This PR does not fixx #12345

[Chris Smith]

I added a quick reference for SymPy here and referred to that in the Development workflow. Perhaps a link to this with short url would be better to put in the template: https://tinyurl.com/autoclose-syntax