Get-Help may report parameters with ValueFromRemainingArguments attribute as pipeline-able (#23871)

* Remove FromRemainingArguments as an inputs indicator.

The parameter attribute FromRemainingArguments is not an indicator of pipeline input.

src/System.Management.Automation/help/DefaultCommandHelpObjectBuilder.cs

@@ -605,9 +605,7 @@ namespace System.Management.Automation.Help
 
                     foreach (ParameterAttribute attrib in attribs)
                     {
-                        if (attrib.ValueFromPipeline ||
-                            attrib.ValueFromPipelineByPropertyName ||
-                            attrib.ValueFromRemainingArguments)
+                        if (attrib.ValueFromPipeline || attrib.ValueFromPipelineByPropertyName)
                         {
                             if (!inputs.Contains(parameter.Value.ParameterType.FullName))
                             {

test/powershell/engine/Help/HelpSystem.Tests.ps1

@@ -695,3 +695,21 @@ Describe 'Update-Help allows partial culture matches' -Tags 'CI' {
         Test-UpdateHelpAux $null $Pass
     }
 }
+
+Describe 'InputTypes accurately describe pipelinable input' {
+    BeforeAll {
+        function invoke-inputtypetest {
+            [CmdletBinding()]
+            param (
+            [Parameter(Position=0,Mandatory=$true,ValueFromPipeline=$true)][string]$a,
+            [Parameter(Position=1,ValueFromRemainingArguments=$true)][object[]]$c)
+            Process { "$a $c" }
+        }
+    }
+
+    It 'Should have only 1 input type' {
+        $inputTypes = (Get-Help -full invoke-inputtypetest).inputtypes.inputtype.type.name.trim().split("`n")
+        $inputTypes.Count | Should -Be 1
+        $inputTypes | Should -Be "System.String"
+    }
+}