Fix errors in ShouldProcess rule document (#1766)

* Fix ShouldProcess examples

* Fix Severity of ShouldProcess to Warning

* Add Get-Help

* Update links

* Copy example from Docs repo

* Update ShouldProcess.md

Co-authored-by: Sean Wheeler <sean.wheeler@microsoft.com>

Author: masaru-iritani

docs/Rules/README.md

@@ -55,7 +55,7 @@ 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         |                 |

docs/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
 
@@ -66,10 +66,5 @@ function Set-File
     {
         $Content | Out-File -FilePath $Path
     }
-    else
-    {
-        # Code that should be processed if doing a WhatIf operation
-        # Must NOT change anything outside of the function / script
-    }
 }
 ```