docs: path adjustments to allow documentation to build again

- adding doc files to .gitignore

Change-Id: Ia6b2358bb1f236298ad1d705c1bed0636026632d

runtime/docs/doxygen/Doxyfile

@@ -917,7 +917,7 @@ WARN_LOGFILE           =
 # spaces. See also FILE_PATTERNS and EXTENSION_MAPPING
 # Note: If this tag is empty the current directory is searched.
 
-INPUT                  = ../../src/inc/
+INPUT                  = ../../hsa-runtime/inc/
 
 # This tag can be used to specify the character encoding of the source files
 # that doxygen parses. Internally doxygen uses the UTF-8 encoding. Doxygen uses