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/si1132/si1132.hpp

@@ -52,6 +52,7 @@ namespace upm {
  * @man silabs
  * @web http://www.silabs.com/products/sensors/infraredsensors/Pages/si1132.aspx
  * @con i2c
+ * @snippet si1132.cxx Interesting
  * @if ilightsensor
 
  */