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/grovebutton.hpp

@@ -49,7 +49,7 @@ namespace upm {
  * Basic UPM module for the Grove button
  *
  * @image html grovebutton.jpg
- * @snippet grovebutton.cxx Interesting
+ * @snippet grove-grovebutton.cxx Interesting
  */
 class GroveButton: public Grove {
     public:

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:

src/grove/grovelight.hpp

@@ -52,7 +52,7 @@ namespace upm {
  * An approximate lux value can also be returned.
  *
  * @image html grovelight.jpg
- * @snippet grovelight.cxx Interesting
+ * @snippet grove-grovelight.cxx Interesting
  */
 class GroveLight: public Grove {
     public:

src/grove/groverelay.hpp

@@ -51,7 +51,7 @@ namespace upm {
  * the indicator LED lights up and current is allowed to flow.
  *
  * @image html groverelay.jpg
- * @snippet groverelay.cxx Interesting
+ * @snippet grove-groverelay.cxx Interesting
  */
 class GroveRelay: public Grove {
     public:

src/grove/groverotary.hpp

@@ -51,7 +51,7 @@ namespace upm {
  * to do the same relative to the center of the knob's range.
  *
  * @image html rotaryencoder.jpg
- * @snippet groverotary.cxx Interesting
+ * @snippet grove-groverotary.cxx Interesting
  */
 class GroveRotary: public Grove {
     public:

src/grove/groveslide.hpp

@@ -48,7 +48,7 @@ namespace upm {
  * returns either a raw value or a scaled voltage value.
  *
  * @image html slide.jpg
- * @snippet groveslide.cxx Interesting
+ * @snippet grove-groveslide.cxx Interesting
  */
 class GroveSlide: public Grove {
     public:

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: