Fix typos in resource strings and associated C# references

[casuffitsharp]

• Correct misspellings in Strings.resx (e.g., 'equaltiy', 'whitepsace')
• Rename misspelled resource keys for consistency
• Update C# rule files to reflect new resource key names

PR Summary

This PR fixes several typos and grammatical errors identified in the Rules/Strings.resx file. It also renames resource keys that contained misspellings. Corresponding references in C# rule files have been updated to maintain build stability.

PR Checklist

• PR has a meaningful title
  • Use the present tense and imperative mood when describing your changes
• Summarized changes
• Change is not breaking
• Make sure all .cs, .ps1 and .psm1 files have the correct copyright header
• Make sure you've added a new test if existing tests do not effectively test the code changed and/or updated documentation
• This PR is ready to merge and is not Work in Progress.
  • If the PR is work in progress, please add the prefix WIP: to the beginning of the title and remove the prefix when the PR is ready.

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[Copilot]

Pull request overview

This PR cleans up user-facing rule resource strings by correcting typos/grammar and aligns C# rule implementations to renamed .resx resource keys so the strongly-typed Strings references continue to compile.

Changes:

• Fixed multiple typos/wording issues in Rules/Strings.resx.
• Renamed misspelled resource keys to correctly spelled names.
• Updated C# rule files to reference the new resource key/property names.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
Rules/UseShouldProcessForStateChangingFunctions.cs	Updates Strings.* reference to the corrected ...Description resource key.
Rules/UseLiteralInitializerForHashtable.cs	Replaces misspelled resource property names with corrected UseLiteralInitializer... keys.
Rules/PossibleIncorrectComparisonWithNull.cs	Updates to the corrected ...SuggestedCorrectionDescription resource key.
Rules/Strings.resx	Fixes typos/grammar in values and renames several misspelled resource keys.

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