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/hcsr04/CMakeLists.txt

@@ -1,5 +1,5 @@
 set (libname "hcsr04")
-set (libdescription "Proximity sensor")
+set (libdescription "Ultrasonic Distance Measuring Sensor")
 set (module_src ${libname}.cxx)
 set (module_hpp ${libname}.hpp)
 upm_module_init(mraa)

src/hcsr04/hcsr04.hpp

@@ -43,10 +43,11 @@ namespace upm {
 /**
  * @library hcsr04
  * @sensor hcsr04
- * @comname HC-SR04 Ultrasonic Sensor
+ * @comname Ultrasonic Distance Measuring Sensor
  * @type sound
  * @man generic
  * @con gpio
+ * @web https://www.sparkfun.com/products/13959
  *
  * @brief API for the HC-SR04 Ultrasonic Sensor
  *