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/ds1307/CMakeLists.txt

@@ -1,5 +1,5 @@
 set (libname "ds1307")
-set (libdescription "Real time clock (RTC) module")
+set (libdescription "Real Time Clock (RTC) Module")
 set (module_src ${libname}.cxx)
 set (module_hpp ${libname}.hpp)
 upm_module_init(mraa)

src/ds1307/ds1307.hpp

@@ -51,11 +51,12 @@ namespace upm {
   /**
    * @library ds1307
    * @sensor ds1307
-   * @comname Grove RTC (Real-Time Clock)
+   * @comname Real Time Clock (RTC) Module
    * @altname DS1307 RTC
    * @type time
    * @man seeed
    * @con i2c
+   * @web https://www.maximintegrated.com/en/products/digital/real-time-clocks/DS1307.html
    *
    * @brief API for the DS1307 Real-Time CLock
    *