snippet: Updated all snippet tags

Ensure all src C++ headers which have corresponding C++ examples have
doxygen tags which point to those examples.  Some were missing, some
were invalid, some needed to be updated to match the new example names.

Signed-off-by: Noel Eck <noel.eck@intel.com>

src/grove/groveled.hpp

@@ -53,8 +53,8 @@ namespace upm {
  * to the cathode, while the rounded side corresponds to the anode.
  *
  * @image html groveled.jpg
- * @snippet groveled.cxx Interesting
- * @snippet groveled-multi.cxx Interesting
+ * @snippet grove-groveled.cxx Interesting
+ * @snippet grove-groveled-multi.cxx Interesting
  */
 class GroveLed: public Grove {
     public: