fix: missing paren in link in "Resolving a merge conflict on GitHub"

[perryprog]

Why:

Closes #12019

What's being changed:

I've added the missing paren to the markdown's link.

Check off the following:

• I have reviewed my changes in staging (look for "Automatically generated comment" and click Modified to view your latest changes).
• For content changes, I have completed the self-review checklist.

Writer impact (This section is for GitHub staff members only):

• This pull request impacts the contribution experience
  • I have added the 'writer impact' label
  • I have added a description and/or a video demo of the changes below (e.g. a "before and after video")

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Content directory changes

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Source	Staging	Production	What Changed
content/pull-requests/collaborating-with-pull-requests/addressing-merge-conflicts/resolving-a-merge-conflict-on-github.md	Modified	Original

[perryprog]

@ramyaparimi, if this was for the missing PR description (and issue), that's my bad—it seems making a PR through GitHub.dev totally bypasses any option to fill out the description. See also the now-linked issue.

Note that I cannot self-review or check the generated content as the staged version is no longer live.

[ramyaparimi]

@perryprog Thanks so much for clarifying ✨ Description and linking issue helps a lot during triaging 💖
The changes LGTM, I will get this merged asap 🍏

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