doc: Scrubbed ALL sensor library descriptions

In an effort to clean-up and standardize UPM library
documentation, this commit updates (and in most cases,
unifies) the CMake description string AND CXX header
@comname string.

Strings were taken from datasheets when possible, spelling
mistakes were addressed, copy/paste errors where fixed,
Title Case was used, etc.

    * Tested/updated/added @web tags
    * Added/updated invalid sensor images
    * Added/updated @man tags, added missing manufacturers

Signed-off-by: Noel Eck <noel.eck@intel.com>

src/ldt0028/CMakeLists.txt

@@ -1,5 +1,5 @@
 upm_mixed_module_init (NAME ldt0028
-    DESCRIPTION "Piezo vibration sensor"
+    DESCRIPTION "Piezo Vibration Sensor"
     C_HDR ldt0028.h
     C_SRC ldt0028.c
     CPP_HDR ldt0028.hpp

src/ldt0028/ldt0028.hpp

@@ -37,11 +37,12 @@ namespace upm {
 /**
  * @library ldt0028
  * @sensor ldt0028
- * @comname LDT0-028 Piezo Vibration Sensor
+ * @comname Piezo Vibration Sensor
  * @altname Grove Piezo Vibration Sensor
  * @type flexfor
  * @man seeed
  * @con analog
+ * @web http://wiki.seeed.cc/Grove-Piezo_Vibration_Sensor/
  *
  * @brief API for LDT0-028 PZT film-based sensors,
  * such as a Grove Piezo Vibration sensor