[ru] Update _index.md before merging dev-ru

[shurup]

Describe your changes

Applying small changes to _index.md before we can merge dev-ru to main (as requested by @seokho-son).

Related issue number or link (ex: resolves #issue-number)

#3031

Checklist before opening this PR (put x in the checkboxes)

• This PR does not contain plagiarism
  • don’t copy other people’s work unless you are quoting and contributing it to them.
• I have signed off on all commits
  • signing off (ex: git commit -s) is to affirm that commits comply DCO. If you are working locally, you could add an alias to your gitconfig by running git config --global alias.ci "commit -s".

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[seokho-son]

@shurup please note that creating a feature branch in upsteam for individual (approvers) use should be limited. upstream branches will be cloned by all individual contributors.

[shurup]

@seokho-son oh, sorry! I followed the GitHub UI for this time (instead of doing everything in the terminal as I normally do), and it went a different way I didn't notice. I'll be more mindful next time.