Update documentation of MAT_F_COMPLEX flag when creating variable
Update documentation of MAT_F_COMPLEX flag when creating variable

* src/mat.c (Mat_VarCreate): Update the documentation of MAT_F_COMPLEX
      to specify that the data is a pointer to a type of
      struct ComplexSplit

martinichka/matio-coder,telehan/libmatio,MaartenBent/matio,CBL-ORION/matio,tbeu/matio,tbeu/matio,MaartenBent/matio,NJannasch/matio,MaartenBent/matio,CBL-ORION/matio-sf-mirror,MaartenBent/matio,martinichka/matio-coder,tbeu/matio,NJannasch/matio,CBL-ORION/matio,CBL-ORION/matio-sf-mirror,tbeu/matio,martinichka/matio-coder,telehan/libmatio