Add script docstrings

Scripts/Install-NewestPackage.ps1

+# Helper script to locate the latest AutoTx installation package (expected to be
+# in a subdirectory of this script with a name like `build_2019-04-23_12-34-56`)
+# and call the installer script from *within* that package.
+
 # Make sure to run from the directory containing the script itself:
 $BaseDir = $(Split-Path $MyInvocation.MyCommand.Path)
 Push-Location $BaseDir

Scripts/Install-Service.ps1

-# helper script to install the AutoTx service on a computer
+# Helper script to install the AutoTx service on a computer. It is intended to
+# be run from *within* an AutoTx installation package created with the
+# `Make-Package.ps1` script.
+#
+# NOTE: the script will NOT update an existing installation of AutoTx!
 
 # set our requirements:
 #Requires -version 5.1

Scripts/Make-Package.ps1

-# helper script to create a package from an AutoTx build that can be used from
-# the included "Install-Service.ps1" script as well as with the AutoTx-Updater
+# Helper script to create a package from an AutoTx build that can be used from
+# the included `Install-Service.ps1` script as well as with the AutoTx-Updater.
 
 # set our requirements:
 #Requires -version 5.1

Scripts/Prepare-Build.ps1

+# Helper script to be called by Visual Studio as a "pre-build" command.
+
 [CmdletBinding(DefaultParameterSetName="build")]
 Param(
     [Parameter(Mandatory=$True, ParameterSetName="build")]

Scripts/Provide-UpdaterPackage.ps1

+# Helper script to locate the latest AutoTx installation package (expected to be
+# in a subdirectory of this script with a name like `build_2019-04-23_12-34-56`)
+# and copy it to the correct path so it can be picked up the AutoTx-Updater.
+#
+# NOTE: the script will prune a few files (currently hardcoded) from the package
+# copied to the central update location to prevent sensitive information from
+# being accidentially leaked through a publicly accessible location (see the
+# `$Exclude` variable below).
+
+
 [CmdletBinding()]
 Param(
     [Parameter(Mandatory=$True)][String] $UpdaterSettings