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/maxds3231m/CMakeLists.txt

@@ -1,5 +1,5 @@
 set (libname "maxds3231m")
-set (libdescription "Realtime clock sensor from MAX family")
+set (libdescription "Realtime Clock (RTC) Sensor Library")
 set (module_src ${libname}.cxx)
 set (module_hpp ${libname}.hpp)
 upm_module_init(mraa)

src/maxds3231m/maxds3231m.hpp

@@ -70,10 +70,11 @@ struct Time3231 {
 /**
  * @library maxds3231m
  * @sensor maxds3231m
- * @comname MAXDS3231M Real-Time Clock
+ * @comname Realtime Clock (RTC) Sensor Library
  * @type light
  * @man maxim
  * @con i2c
+ * @web https://www.maximintegrated.com/en/products/digital/real-time-clocks/DS3231.html
  *
  * @brief API for the MAXDS3231M I2C Real-Time Clock
  *