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/grovegprs/CMakeLists.txt

@@ -1,5 +1,5 @@
 set (libname "grovegprs")
-set (libdescription "Grove GPRS module")
+set (libdescription "GPRS Module")
 set (module_src ${libname}.cxx)
 set (module_hpp ${libname}.hpp)
 upm_module_init(mraa)

src/grovegprs/grovegprs.hpp

@@ -49,7 +49,7 @@ namespace upm {
     /**
      * @library grovegprs
      * @sensor grovegprs
-     * @comname Grove GPRS Module
+     * @comname GPRS Module
      * @type wifi
      * @man seeed
      * @con uart
@@ -67,7 +67,7 @@ namespace upm {
      *
      * It is connected via a UART at 19200 baud.
      *
-     * @image html grovegprs.jpg
+     * @image html gprs.jpg
      * @snippet grovegprs.cxx Interesting
      */