Update doc/ci/resource_groups/index.md || Issue Number 353252

What does this MR do and why?

Describe in detail what your merge request does and why.

I have changed index.md as per below recommendations.

• doc/ci/resource_groups/index.md:45:1:gitlab.Wordy:Be concise: "to" is less wordy than "In order to".
• doc/ci/resource_groups/index.md:77:38:gitlab.Simplicity:Avoid words like "useful" that imply ease of use, because the user may find this action hard.
• doc/ci/resource_groups/index.md:83:16:gitlab.Simplicity:Avoid words like "useful" that imply ease of use, because the user may find this action hard.
• doc/ci/resource_groups/index.md:84:3:gitlab.UnclearAntecedent:'This is' is not precise. Try rewriting with a specific subject and verb.
• doc/ci/resource_groups/index.md:91:16:gitlab.Simplicity:Avoid words like "useful" that imply ease of use, because the user may find this action hard.
• doc/ci/resource_groups/index.md:97:53:gitlab.SubstitutionWarning:If possible, use "must" instead of "need to".
• doc/ci/resource_groups/index.md:148:103:gitlab.Simplicity:Avoid words like "useful" that imply ease of use, because the user may find this action hard.
• doc/ci/resource_groups/index.md:208:1:gitlab.SubstitutionSuggestions:Consider "because" or "after" instead of "Since".
• doc/ci/resource_groups/index.md:232:116:gitlab.FutureTense:Avoid using future tense: "going to be". Use present tense instead.
• doc/ci/resource_groups/index.md:235:1:gitlab.SubstitutionSuggestions:Consider "because" or "after" instead of "Since".

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