DOC: Explain what rcParams["legend.labelcolor"] = None means

Author: timhoffm

lib/matplotlib/mpl-data/matplotlibrc

@@ -569,7 +569,7 @@
 #legend.scatterpoints: 1        # number of scatter points
 #legend.markerscale:   1.0      # the relative size of legend markers vs. original
 #legend.fontsize:      medium
-#legend.labelcolor:    None
+#legend.labelcolor:    None     # If None defaults to text.color
 #legend.title_fontsize: None    # None sets to the same as the default axes.
 
 ## Dimensions as fraction of font size: