DOC: fix versionchanged blank line usage (pandas-dev#49117)

Author: mathpn

pandas/plotting/_core.py

@@ -692,14 +692,17 @@ class PlotAccessor(PandasObject):
         The matplotlib line style per column.
     logx : bool or 'sym', default False
         Use log scaling or symlog scaling on x axis.
+
         .. versionchanged:: 0.25.0
 
     logy : bool or 'sym' default False
         Use log scaling or symlog scaling on y axis.
+
         .. versionchanged:: 0.25.0
 
     loglog : bool or 'sym', default False
         Use log scaling or symlog scaling on both x and y axes.
+
         .. versionchanged:: 0.25.0
 
     xticks : sequence