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/sht1x/CMakeLists.txt

@@ -1,5 +1,5 @@
 upm_mixed_module_init (NAME sht1x
-    DESCRIPTION "Temperature and humidity sensor"
+    DESCRIPTION "Temperature and Humidity Sensor"
     C_HDR sht1x.h
     C_SRC sht1x.c
     CPP_HDR sht1x.hpp

src/sht1x/sht1x.hpp

@@ -41,9 +41,10 @@ namespace upm {
   /**
    * @library sht1x
    * @sensor sht1x
-   * @comname SHT1X Temperature and Humidity Sensor
+   * @comname Temperature and Humidity Sensor
    * @type temp
    * @man dfrobot
+   * @web https://www.dfrobot.com/wiki/index.php/SHT1x_Humidity_and_Temperature_Sensor_(SKU:_DFR0066)
    * @con gpio
    *
    * @brief SHT1X Temperature and Humidity Sensor