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/bmp280/bme280.hpp

@@ -54,7 +54,7 @@ namespace upm {
      * performance compatible to the Bosch Sensortec BMP280 digital
      * pressure sensor.
      *
-     * @snippet bme280.cxx Interesting
+     * @snippet bmp280-bme280.cxx Interesting
      */
 
     class BME280 : public BMP280, public IHumiditySensor {