Fix typos in resource strings and associated C# references (#2163)

* Fix typos and grammatical errors in resource strings
- 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

* Strings: fix grammar and casing in rule descriptions
- Combine sentence fragment in AvoidUsingEmptyCatchBlockDescription for better flow
- Update 'Whatif' to 'WhatIf' in UseSupportsShouldProcess strings to match PowerShell naming conventions

* Strings: improve AvoidUsingEmptyCatchBlockDescription phrasing