xmlrpc putPage and appendPage should return bool

According to dokuwiki's documentation (https://www.dokuwiki.org/devel:xmlrpc#wikiputpage),
those two xmlrpc methods should return bool, not int.

They currently return unconditionally the xmlrpc int 0 (which isn't cast automatically to bool for example with the java library http://ws.apache.org/xmlrpc/)

Please let me know if documentation should be updated instead.