Addresed PR comments

Author: eicchen

doc/source/whatsnew/v3.0.0.rst

@@ -800,7 +800,7 @@ Plotting
 - Bug in :meth:`DataFrame.plot.bar` with ``stacked=True`` where labels on stacked bars with zero-height segments were incorrectly positioned at the base instead of the label position of the previous segment (:issue:`59429`)
 - Bug in :meth:`DataFrame.plot.line` raising ``ValueError`` when set both color and a ``dict`` style (:issue:`59461`)
 - Bug in :meth:`DataFrame.plot` that causes a shift to the right when the frequency multiplier is greater than one. (:issue:`57587`)
-- Bug in :meth:`DataFrame.plot` where ``title`` would require more titles than needed when graphing more than one column per subplot. (:issue:`61019`)
+- Bug in :meth:`DataFrame.plot` where ``title`` would require extra titles when plotting more than one column per subplot. (:issue:`61019`)
 - Bug in :meth:`Series.plot` preventing a line and bar from being aligned on the same plot (:issue:`61161`)
 - Bug in :meth:`Series.plot` preventing a line and scatter plot from being aligned (:issue:`61005`)
 - Bug in :meth:`Series.plot` with ``kind="pie"`` with :class:`ArrowDtype` (:issue:`59192`)

pandas/plotting/_matplotlib/core.py

@@ -802,14 +802,14 @@ def _adorn_subplots(self, fig: Figure) -> None:
         if self.title:
             if self.subplots:
                 if is_list_like(self.title):
-                    if type(self.subplots) != bool:
+                    if not isinstance(self.subplots, bool):
                         if len(self.subplots) != len(self.title):
                             raise ValueError(
                                 "The length of `title` must equal the number "
                                 "of subplots if `title` of type `list` "
                                 "and subplots is iterable.\n"
-                                f"length of title = {len(self.title)}\n"
-                                f"number of subplots = {len(self.subplots)}"
+                                f"The number of titles ({len(self.title)}) must equal "
+                                f"the number of subplots ({len(self.subplots)})."
                             )
                     elif len(self.title) != self.nseries:
                         raise ValueError(