DOC: Indicate versionchanged for xlabel/ylabel docs.

Author: stefmolin

pandas/plotting/_core.py

@@ -720,16 +720,24 @@ class PlotAccessor(PandasObject):
 
            Now applicable to planar plots (`scatter`, `hexbin`).
 
+        .. versionchanged:: 1.6.0
+
+            Now applicable to histograms.
+
     ylabel : label, optional
         Name to use for the ylabel on y-axis. Default will show no ylabel, or the
         y-column name for planar plots.
 
         .. versionadded:: 1.1.0
 
-        .. versionchanged:: 1.2.0
+        .. versionchanged:: 2.0.0
 
            Now applicable to planar plots (`scatter`, `hexbin`).
 
+        .. versionchanged:: 2.0.0
+
+            Now applicable to histograms.
+
     rot : float, default None
         Rotation for ticks (xticks for vertical, yticks for horizontal
         plots).