Fix reason value complete→ completed

[bigwheel]

Why:

"reason:complete" query returns nothing. "reason:completed" works well.
I guess this is simple typo.

https://github.com/github/docs/issues?q=is%3Aissue+reason%3Acomplete → not worked
https://github.com/github/docs/issues?q=is%3Aissue+reason%3Acompleted → works well

What's being changed (if available, include any code snippets, screenshots, or gifs):

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Source	Preview	Production	What Changed
issues/tracking-your-work-with-issues/filtering-and-searching-issues-and-pull-requests.md	fpt ghec ghes@ 3.8 3.7 3.6 3.5 3.4 ghae	fpt ghec ghes@ 3.8 3.7 3.6 3.5 3.4 ghae

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[cmwilson21]

@bigwheel Thanks so much for opening a PR! I'll get this triaged for review ⚡

[sabrowning1]

👋🏼 Hi @bigwheel, thanks for catching this! Your fix looks great, I'll get this merged shortly 🚀 thanks again for your help maintaining our docs! ✨

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[avilanicasionan92]

#24880 (comment)