[Doc] Attempt to clean the set of namespaces exposed by Doxygen

documentation/doxygen/Doxyfile

@@ -989,7 +989,9 @@ EXCLUDE_PATTERNS       = */G__* \
 # Note that the wildcards are matched against the file with absolute path, so to
 # exclude all test directories use the pattern */test/*
 
-EXCLUDE_SYMBOLS        =
+EXCLUDE_SYMBOLS        = std \
+                         cling* \
+                         rf*_*
 
 # The EXAMPLE_PATH tag can be used to specify one or more files or directories
 # that contain example code fragments that are included (see the \include