Update ZARestRequest and associated tests.

ZertoApiWrapper/Public/Invoke-ZARestRequest.ps1

@@ -1,26 +1,38 @@
+<# .ExternalHelp ./en-us/ZertoApiWrapper-help.xml #>
 function Invoke-ZARestRequest {
     [cmdletbinding()]
     param(
         # Parameter help description
-        [Parameter(Mandatory)]
+        [Parameter(
+            Mandatory,
+            Helpmessage = "URI endpoint to be utilized. When submitting the URI, only the endpoint needs to be submitted. Please review the help documentation for examples."
+        )]
         [ValidateNotNullOrEmpty()]
         [string]$uri,
+        [Parameter(
+            Helpmessage = "API method to be used. GET, PUT, POST, or DELETE. Refer to documentation for the API endpoint to ensure the correct method is being used. If unspecified, defaults to GET"
+        )]
         [ValidateSet("GET", "PUT", "POST", "DELETE")]
         [string]$method = "GET",
+        [Parameter(
+            Helpmessage = "Body to be submitted to the REST API endpoint. This needs to be submitted in JSON format"
+        )]
         [ValidateNotNullOrEmpty()]
-        [string]$body,
-        [ValidateNotNullOrEmpty()]
-        [string]$contentType = "application/json"
+        [string]$body
+
     )
+    # While the API can use XML or JSON, this module is built on JSON functionality. Currently forcing all
+    # content types and language to JSON.
+    [string]$contentType = "application/json"
 
     # Check to see if the required variables are present and currently valid
     if ( -not ((Test-Path variable:script:zaLastActionTime) -and (Test-Path variable:script:zaHeaders)) ) {
         Throw "Zerto Analytics Connection does not Exist. Please run Connect-ZertoAnalytics first to establish a connection"
-    } elseif ( (Test-Path variable:script:zaHeaders) -and $([datetime]$script:zaLastActionTime).addMinutes(60) -lt $(get-date) ) {
+    } elseif ( (Test-Path variable:script:zaHeaders) -and $([datetime]$script:zaLastActionTime).addMinutes(60) -lt $(Get-Date) ) {
         Throw "Authorization Token has Expired. Please re-authorize to the Zerto Analytics Portal"
     } else {
         # Update the last action time and submit the request based on PS Version.
-        Set-Variable -Name zaLastActionTime -Scope Script -Value $(Get-date).Ticks
+        Set-Variable -Name zaLastActionTime -Scope Script -Value $(Get-Date).Ticks
         $submittedUri = "https://analytics.api.zerto.com/v2/{0}" -f $uri
         if ($PSVersionTable.PSVersion.Major -ge 6) {
             Invoke-RestMethod -Uri $submittedUri -Method $method -Body $body -Headers $Script:zaHeaders -ContentType $contentType -TimeoutSec 100