Documentation: Add note about road stop parent scope

docs/newgrf-roadstops-nml.html

@@ -18,7 +18,8 @@
 	This feature does not match OpenTTD PR #7955 in a number of key areas, this feature may not necessarily match implementations of NewGRF road stops in other patches, branches, etc.</br>
 	This feature as implemented here MAY also be present in other patchpacks.</p>
 
-	<p>The feature identifier is <span class="code">FEAT_ROADSTOPS</span>.</p>
+	<p>The feature identifier is <span class="code">FEAT_ROADSTOPS</span>, (the PARENT scope for this feature is the road stop's station's town).<br />
+	There is no permanent storage associated with this feature.</p>
 
 	<p>See the <a href="newgrf-additions-nml.html">NewGRF additions (NML)</a> document for background information on additions to NML.</p>
 

docs/newgrf-roadstops.html

@@ -195,6 +195,7 @@
 	<h3 id="varaction2roadstops">Variational Action 2 - Road Stops</h3>
 
 	<p>See the <a href="https://newgrf-specs.tt-wiki.net/wiki/VariationalAction2">Variational Action 2 Specification</a> for background information.</p>
+	<p>The parent scope for this feature is the road stop's station's town.</p>
 
 	<b>Variables:</b>
 	<table>