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/lcd/eboled.hpp

@@ -79,7 +79,7 @@ namespace upm
    * <a href=https://creativecommons.org/licenses/by-nc-sa/3.0/>
    * CC BY-NC-SA-3.0</a>.</em>
    *
-   * @snippet eboled.cxx Interesting
+   * @snippet i2clcd-eboled.cxx Interesting
    */
   class EBOLED : public LCD
   {

src/lcd/ssd1306.hpp

@@ -103,7 +103,7 @@ const uint8_t  SSD1306_LCDHEIGHT = 64;
  * SSD1306 device from eBay.
  *
  * @image html ssd1306.jpeg
- * @snippet ssd1306-oled.cxx Interesting
+ * @snippet i2clcd-ssd1306-oled.cxx Interesting
  */
 class SSD1306 : public LCD
 {

src/lcd/ssd1308.hpp

@@ -51,7 +51,7 @@ const uint8_t DISPLAY_CMD_SET_NORMAL_1308 = 0xA6;
  * Display module, which is an OLED monochrome display.
  *
  * @image html ssd1308.jpeg
- * @snippet ssd1308-oled.cxx Interesting
+ * @snippet i2clcd-ssd1308-oled.cxx Interesting
  */
 class SSD1308 : public LCD
 {

src/lcd/ssd1327.hpp

@@ -50,7 +50,7 @@ const uint8_t DISPLAY_CMD_SET_NORMAL = 0xA4;
  * which is an OLED monochrome display.
  *
  * @image html ssd1327.jpeg
- * @snippet ssd1327-oled.cxx Interesting
+ * @snippet i2clcd-ssd1327-oled.cxx Interesting
  */
 class SSD1327 : public LCD
 {