Fix typos and standardize terminology in documentation files

[kube-gopher]

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• Certify you wrote the patch or otherwise have the right to pass it on as an open-source patch by signing all
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  for more information.git commit -s``git commit -s --amend
• Referenced issues using in commit message (if applicable)Fixes: #00000
• Tests have been added/updated (or no tests are needed)
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• Release note entered in the section below (or if no user-facing changes)None

这种公关是否引入了面向用户的改变？

None

Changes made:

fixes #27849

1. Downloads.md
   Fixed grammatical error: where as → whereas

2. RELEASE.md
   Fixed spelling error: abbrieviated → abbreviated

3. ISSUE.md
   Fixed spelling errors: repoducer → reproducer (2 instances)
   Standardized time zone reference: UT → UTC for consistency with technical documentation conventions

[baude]

LGTM, thank you for your submission.

[kube-gopher]

Thanks!

[kube-gopher]

/packit test

[ashley-cui]

LGTM, thanks!