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/adxl335/CMakeLists.txt

@@ -1,5 +1,5 @@
 set (libname "adxl335")
-set (libdescription "Adxl335 grove 3-axis anaolog accelerometer")
+set (libdescription "Low-power, 3-axis +/- 3 g Accelerometer")
 set (module_src ${libname}.cxx)
 set (module_hpp ${libname}.hpp)
 upm_module_init(mraa)

src/adxl335/adxl335.hpp

@@ -43,11 +43,12 @@ namespace upm {
   /**
    * @library adxl335
    * @sensor adxl335
-   * @comname ADXL335 3-Axis Analog Accelerometer
+   * @comname Low-power, 3-axis +/- 3 g Accelerometer
    * @altname Grove 3-Axis Analog Accelerometer
    * @type accelerometer
    * @man seeed
    * @con analog
+   * @web http://www.analog.com/en/products/mems/accelerometers/adxl335.html
    *
    * @brief API for the ADXL335 3-Axis Analog Accelerometer
    *