Change "rare" to "all available"

"Rare" is a loaded term, unnecessarily implying (without much
foundation) the likelihood/frequency that a user may use inputs deemed
"not primary" by the OS/UA.

In addition, as `any-*` also include the pointer that is deemed primary,
the "rare" moniker is even more inappropriate, as by definition the
"primary" is not "rare".

Author: patrickhlauke

mediaqueries/Overview.bs

@@ -1723,7 +1723,7 @@ Hover Capability: the 'hover' feature</h3>
 	</div>
 
 <h3 id='any-input'>
-Rare Interaction Capabilities: the 'any-pointer' and 'any-hover' features</h3>
+All Available Interaction Capabilities: the 'any-pointer' and 'any-hover' features</h3>
 
 	<pre class='descdef mq'>
 	Name: any-pointer