fix conf patterns (conan-io#3736)

Author: memsharded

reference/config_files/global_conf.rst

@@ -184,7 +184,7 @@ You can use package patterns to apply the configuration in those dependencies wh
 .. code-block:: text
 
     *:tools.cmake.cmaketoolchain:generator=Ninja
-    zlib:tools.cmake.cmaketoolchain:generator=Visual Studio 16 2019
+    zlib/*:tools.cmake.cmaketoolchain:generator=Visual Studio 16 2019
 
 This example shows you how to specify a general ``generator`` for all your packages except for ``zlib`` which is defining
 ``Visual Studio 16 2019`` as its generator.
@@ -194,7 +194,7 @@ configuration lines above:
 
 .. code-block:: text
 
-    zlib:tools.cmake.cmaketoolchain:generator=Visual Studio 16 2019
+    zlib/*:tools.cmake.cmaketoolchain:generator=Visual Studio 16 2019
     *:tools.cmake.cmaketoolchain:generator=Ninja
 
 The result is that you're specifying a general ``generator`` for all your packages, and that's it. The ``zlib`` line has no