pydoc: Removed include for sensor specific _doc.i files

There is a single monolithic .i file which provides documentation for
the python methods.  The per-sensor flow is not used.  Removing for now,
may investigate implementing a per-sensor doc.i file again in the future.

Signed-off-by: Noel Eck <noel.eck@intel.com>

src/htu21d/pyupm_htu21d.i

@@ -3,10 +3,6 @@
 %module pyupm_htu21d
 %include "../upm.i"
 
-#ifdef DOXYGEN
-%include "htu21d_doc.i"
-#endif
-
 %include "htu21d.hpp"
 %{
     #include "htu21d.hpp"