Minimal Readme documentation for the undump-buildings command

Readme.html

@@ -512,6 +512,7 @@ access DF memory and allow for easier development of new tools.</p>
 <li><a class="reference internal" href="#embark" id="id134">embark</a></li>
 <li><a class="reference internal" href="#lever" id="id135">lever</a></li>
 <li><a class="reference internal" href="#stripcaged" id="id136">stripcaged</a></li>
+<li><a class="reference internal" href="#undump-buildings" id="idundump">undump-buildings</a></li>
 <li><a class="reference internal" href="#create-items" id="id137">create-items</a></li>
 <li><a class="reference internal" href="#soundsense-season" id="id138">soundsense-season</a></li>
 </ul>
@@ -2867,6 +2868,10 @@ alternatively pass cage IDs as arguments:</p>
 stripcaged weapons 25321 34228
 </pre>
 </div>
+<div class="section" id="undump-buildings">
+<h2><a class="toc-backref" href="#idundump">undump-buildings</a></h2>
+<p>Undesignates building base materials for dumping.</p>
+</div>
 <div class="section" id="create-items">
 <h2><a class="toc-backref" href="#id137">create-items</a></h2>
 <p>Spawn arbitrary items under the cursor.</p>

Readme.rst

@@ -2057,6 +2057,10 @@ alternatively pass cage IDs as arguments::
 
   stripcaged weapons 25321 34228
 
+undump-buildings
+================
+Undesignates building base materials for dumping.
+
 create-items
 ============
 Spawn arbitrary items under the cursor.