minor improvement (?) in doc for deserialise method.
minor improvement (?) in doc for deserialise method.

cellml/libcellml,MichaelClerx/libcellml,cellml/libcellml,hsorby/libcellml,nickerso/libcellml,nickerso/libcellml,hsorby/libcellml,hsorby/libcellml,libcellml/buildbot-testing,MichaelClerx/libcellml,cellml/libcellml,nickerso/libcellml,MichaelClerx/libcellml,cellml/libcellml,libcellml/buildbot-testing,nickerso/libcellml,hsorby/libcellml