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/grovetemp.hpp

@@ -52,7 +52,7 @@ namespace upm {
  * device. The range of this sensor is -40 to 125 C and accuracy is +/- 1.5 C.
  *
  * @image html grovetemp.jpg
- * @snippet grovetemp.cxx Interesting
+ * @snippet grove-grovetemp.cxx Interesting
  */
 class GroveTemp: public Grove {
     public: