Fix typos in Pester.BuildAnalyzerRules (#2305)

Pester.BuildAnalyzerRules/Pester.BuildAnalyzerRules.psm1

@@ -2,7 +2,7 @@
 # Should be replaced with the following line when PSScriptAnalyzer is fixed. See Invoke-Pester
 # [Diagnostics.CodeAnalysis.SuppressMessageAttribute('Pester.BuildAnalyzerRules\Measure-SafeCommands', 'Remove-Variable')]
 $IgnoreUnsafeCommands = @('Remove-Variable', 'Write-PesterDebugMessage')
-# Hardcoding SafeCommands-entries to avoid dependency on imported module and slow PSSA-performance when execution Pester.SafeCommands.ps1 (due to many reimports by PSSA).
+# Hardcoding SafeCommands-entries to avoid dependency on imported module and slow PSSA-performance when executing Pester.SafeCommands.ps1 (due to many reimports by PSSA).
 # Consider making build.ps1 update this
 $SafeCommands = [System.IO.File]::ReadAllLines([System.IO.Path]::Join($PSScriptRoot,'SafeCommands.txt'))
 
@@ -11,7 +11,7 @@ function Measure-SafeCommands {
     .SYNOPSIS
     Should use $SafeCommand-variant of external function when available.
     .DESCRIPTION
-    Pester module defines a $SafeCommands dictionary for external commands to avoid hijacking. To fix a violation of this rule, update the call to use SafeCommands variant, ex. `& $SafeCommands['CommandName'] -Param1 Value1`.
+    Pester module defines a $SafeCommands dictionary for external commands to avoid hijacking. To fix a violation of this rule, update the call to use SafeCommands-variant, ex. `& $SafeCommands['CommandName'] -Param1 Value1`.
     .EXAMPLE
     Measure-SafeCommands -CommandAst $CommandAst
     .INPUTS
@@ -83,7 +83,7 @@ Function Measure-ObjectCmdlets {
     .SYNOPSIS
     Should avoid usage of New/Where/Foreach/Select-Object.
     .DESCRIPTION
-    The built-in *-Object-cmdlets are slow compared to alternatives in .NET. To fix a violation of this rule, consider using an alterantive like `foreach`-keyword etc.`.
+    The built-in *-Object-cmdlets are slow compared to alternatives in .NET. To fix a violation of this rule, consider using an alternative like `foreach/for`-keyword etc.`.
     .EXAMPLE
     Measure-ObjectCmdlets -CommandAst $CommandAst
     .INPUTS