Fix several problems in WritingPesterTests guideline (#9078)
Fix several problems in WritingPesterTests guideline (#9078)


JamesWTruher/PowerShell-1,TravisEz13/PowerShell,TravisEz13/PowerShell,daxian-dbw/PowerShell,daxian-dbw/PowerShell,daxian-dbw/PowerShell,PaulHigin/PowerShell,JamesWTruher/PowerShell-1,TravisEz13/PowerShell,PaulHigin/PowerShell,PaulHigin/PowerShell,TravisEz13/PowerShell,daxian-dbw/PowerShell,JamesWTruher/PowerShell-1,PaulHigin/PowerShell,JamesWTruher/PowerShell-1