Ensure the table spans the complete page width (#37129)

docs/templates/plugin.rst.j2

@@ -232,7 +232,7 @@ Facts returned by this module are added/updated in the ``hostvars`` host facts a
         <tr>
             <th class="head"><div class="cell-border">Fact</div></th>
             <th class="head"><div class="cell-border">Returned</div></th>
-            <th class="head"><div class="cell-border">Description</div></th>
+            <th class="head" width="100%"><div class="cell-border">Description</div></th>
         </tr>
         {% for key, value in returnfacts|dictsort recursive %}
             <tr class="return-value-column">
@@ -297,7 +297,7 @@ Common return values are documented :ref:`here <common_return_values>`, the foll
         <tr>
             <th class="head"><div class="cell-border">Key</div></th>
             <th class="head"><div class="cell-border">Returned</div></th>
-            <th class="head"><div class="cell-border">Description</div></th>
+            <th class="head" width="100%"><div class="cell-border">Description</div></th>
         </tr>
         {% for key, value in returndocs|dictsort recursive %}
             <tr class="return-value-column">