disable doxygen undocumented method warning

Very few methods we have are documented, so this is A LOT of noise
hidden the "interesting" warnings about methods which are documented,
but incorrectly and such stuff.

Git-Dch: Ignore

doc/Doxyfile.in

@@ -613,7 +613,7 @@ WARNINGS               = YES
 # for undocumented members. If EXTRACT_ALL is set to YES then this flag will
 # automatically be disabled.
 
-WARN_IF_UNDOCUMENTED   = YES
+WARN_IF_UNDOCUMENTED   = NO
 
 # If WARN_IF_DOC_ERROR is set to YES, doxygen will generate warnings for
 # potential errors in the documentation, such as not documenting some