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/ppd42ns/CMakeLists.txt

@@ -1,5 +1,5 @@
 upm_mixed_module_init (NAME ppd42ns
-    DESCRIPTION "PPD42NS Dust Sensor"
+    DESCRIPTION "Dust Sensor"
     C_HDR ppd42ns.h ppd42ns_data.h
     C_SRC ppd42ns.c
     CPP_HDR ppd42ns.hpp

src/ppd42ns/ppd42ns.hpp

@@ -37,7 +37,7 @@ namespace upm {
     /**
      * @library ppd42ns
      * @sensor ppd42ns
-     * @comname PPD42NS Dust Sensor
+     * @comname Dust Sensor
      * @altname Grove Dust Sensor
      * @type other
      * @man seeed