add issue cross-reference guidance

[XiaoPengMei]

Closes #42376

Summary

• add a short note to the general issue creation flow explaining how to cross-reference a related discussion

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Source	Review	Production	What Changed
issues/tracking-your-work-with-issues/using-issues/creating-an-issue.md	fpt ghec ghes@ 3.20 3.19 3.18 3.17 3.16 3.15 3.14	fpt ghec ghes@ 3.20 3.19 3.18 3.17 3.16 3.15 3.14

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[Sharra-writes]

@XiaoPengMei I have confirmed this works, so I think this is probably all it needs. I'll get it merged when I'm released from the current deploy freeze.

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[jsoref]

Note that this isn't really great.

It doesn't explain that

https://github.com/check-spelling-sandbox/cautious-funicular-special-happiness/discussions/3

Will render as a link, but to get a pretty reference, you need to do:

- https://github.com/check-spelling-sandbox/cautious-funicular-special-happiness/discussions/3

And to get a pretty link for an organization discussion, you have to convert the link.

This won't work:

- https://github.com/orgs/community/discussions/191136#discussioncomment-16386875

You need to use:

- https://github.com/community/community/discussions/191136#discussioncomment-16386875

Samples

check-spelling-sandbox/cautious-funicular-special-happiness#3
https://github.com/orgs/community/discussions/191136#discussioncomment-16386875

• Something check-spelling-sandbox/cautious-funicular-special-happiness#3
• Trailing space after `·` before ⛔ looks out of place community/community#191136 (reply in thread)