Add missing documentation comments

scripts/Windows/Scripts/PowerManagement.ps1

@@ -17,6 +17,9 @@ $null = New-Module {
     <#
         .SYNOPSIS
         Gets the reghistry key containing the `RunOnce` commands.
+
+        .PARAMETER UserKey
+        The key of the user to get the `RunOnce` key for.
     #>
     function Get-RunOnceKey {
         param(

scripts/Windows/Scripts/Registry.ps1

@@ -40,6 +40,13 @@ $null = New-Module {
     [string] $finishedOption = "Finished";
     [RegistryKey] $key = $null;
 
+    <#
+        .SYNOPSIS
+        Edits the `HKEY_CURRENT_USER` key of the default user using the specified action.
+
+        .PARAMETER Action
+        The action to execute on the key.
+    #>
     function Edit-DefaultUserKey {
         param(
             [scriptblock] $Action
@@ -353,6 +360,9 @@ $null = New-Module {
     <#
         .SYNOPSIS
         Sets a value indicating whether the setup has finished.
+
+        .PARAMETER Value
+        The value to set the finished state to.
     #>
     function Set-IsFinished {
         param(

scripts/Windows/Software/VisualStudio/Manage.ps1

@@ -32,6 +32,9 @@ param(
         .SYNOPSIS
         Gets the path to the configuration file in the backup archive.
 
+        .PARAMETER Name
+        The name of the software.
+
         .PARAMETER PackageName
         The name of the package to get the configuration for.
     #>