Fix typos in PSSA docs (#106)

Author: sdwheeler

reference/docs-conceptual/PSScriptAnalyzer/Rules/AvoidUsingWMICmdlet.md

@@ -48,12 +48,12 @@ Change to the equivalent CIM based cmdlet.
 
 ```powershell
 Get-WmiObject -Query 'Select * from Win32_Process where name LIKE "myprocess%"' | Remove-WmiObject
-Invoke-WmiMethod ?Class Win32_Process ?Name "Create" ?ArgumentList @{ CommandLine = "notepad.exe" }
+Invoke-WmiMethod -Class Win32_Process -Name "Create" -ArgumentList @{ CommandLine = "notepad.exe" }
 ```
 
 ### Correct
 
 ```powershell
 Get-CimInstance -Query 'Select * from Win32_Process where name LIKE "myprocess%"' | Remove-CIMInstance
-Invoke-CimMethod ?ClassName Win32_Process ?MethodName "Create" ?Arguments @{ CommandLine = "notepad.exe" }
+Invoke-CimMethod -ClassName Win32_Process -MethodName "Create" -Arguments @{ CommandLine = "notepad.exe" }
 ```

reference/docs-conceptual/PSScriptAnalyzer/Rules/README.md

@@ -57,7 +57,7 @@ The PSScriptAnalyzer contains the following rule definitions.
 | [ReservedCmdletChar](./ReservedCmdletChar.md)                                                     | Error       |        Yes         |                 |
 | [ReservedParams](./ReservedParams.md)                                                             | Error       |        Yes         |                 |
 | [ReviewUnusedParameter](./ReviewUnusedParameter.md)                                               | Warning     |        Yes         |                 |
-| [ShouldProcess](./ShouldProcess.md)                                                               | Error       |        Yes         |                 |
+| [ShouldProcess](./ShouldProcess.md)                                                               | Warning     |        Yes         |                 |
 | [UseApprovedVerbs](./UseApprovedVerbs.md)                                                         | Warning     |        Yes         |                 |
 | [UseBOMForUnicodeEncodedFile](./UseBOMForUnicodeEncodedFile.md)                                   | Warning     |        Yes         |                 |
 | [UseCmdletCorrectly](./UseCmdletCorrectly.md)                                                     | Warning     |        Yes         |                 |

reference/docs-conceptual/PSScriptAnalyzer/Rules/ShouldProcess.md

@@ -14,7 +14,7 @@ title: ShouldProcess
 If a cmdlet declares the `SupportsShouldProcess` attribute, then it should also call
 `ShouldProcess`. A violation is any function which either declares `SupportsShouldProcess` attribute
 but makes no calls to `ShouldProcess` or it calls `ShouldProcess` but does not declare
-`SupportsShouldProcess`
+`SupportsShouldProcess`.
 
 For more information, see the following articles:
 
@@ -26,7 +26,7 @@ For more information, see the following articles:
 
 To fix a violation of this rule, please call `ShouldProcess` method when a cmdlet declares
 `SupportsShouldProcess` attribute. Or please add `SupportsShouldProcess` attribute argument when
-calling `ShouldProcess`
+calling `ShouldProcess`.
 
 ## Example