Fix case-sensitive spelling in scripts that get deployed to C++ repo (#7665)

* Fix case-sensitive spelling in scripts that get deployed to C++ repo

* Removed cspell:ignore per https://github.com/Azure/azure-sdk-for-cpp/pull/5346#discussion_r1486546416

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Co-authored-by: Anton Kolesnyk <antkmsft@users.noreply.github.com>

eng/common/spelling/Invoke-Cspell.ps1

@@ -87,7 +87,7 @@ function Test-VersionReportMatches() {
   $expectedPackageVersion = '6.12.0'
 
   # Act
-  $actual = &"$PSSCriptRoot/Invoke-Cspell.ps1" `
+  $actual = &"$PSScriptRoot/Invoke-Cspell.ps1" `
     -JobType '--version'
 
   # Assert