search: clarify that the case of the name is as requested or all lower

This means that if the requester (whether that is directly from a user
or from another CPS file) specifies the name in a case that is not all
lower, search for that exactly as well as the all lower.

For example, if "OpenGL" is requested, then the name should be searched
as "OpenGL" and as "opengl".

searching.rst

@@ -51,7 +51,7 @@ The various placeholders are as follows:
 
 :var:`name`:
   The name of the package to be located,
-  including both the proper case name,
+  including both the case as specified by the consumer,
   and the name converted to lower case.
 
 :var:`name-like`: