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/hka5/CMakeLists.txt

@@ -1,5 +1,5 @@
 upm_mixed_module_init (NAME hka5
-    DESCRIPTION "DFRobot laser particulate matter (PM) sensor"
+    DESCRIPTION "Laser Particulate Matter (PM) Sensor"
     C_HDR hka5.h
     C_SRC hka5.c
     CPP_HDR hka5.hpp

src/hka5/hka5.hpp

@@ -41,10 +41,11 @@ namespace upm {
   /**
    * @library hka5
    * @sensor hka5
-   * @comname DFRobot Laser PM2.5 Sensor
+   * @comname Laser Particulate Matter (PM) Sensor
    * @type gaseous
    * @man dfrobot
    * @con uart gpio
+   * @web https://www.dfrobot.com/wiki/index.php/DFRobot_LM35_Linear_Temperature_Sensor_(SKU:DFR0023)
    *
    * @brief API for theDFRobot Laser PM2.5 Sensor
    *