Fix line breaking error.

Author: DingkunLiu

surfer/viz.py

@@ -1350,7 +1350,8 @@ def add_label(self, label, color=None, alpha=1, scalar_thresh=None,
             If a label is specified as name, subdir can be used to indicate
             that the label file is in a sub-directory of the subject's
             label directory rather than in the label directory itself (e.g.
-            for ``$SUBJECTS_DIR/$SUBJECT/label/aparc/lh.cuneus.label``
+            for
+            ``$SUBJECTS_DIR/$SUBJECT/label/aparc/lh.cuneus.label``
             ``brain.add_label('cuneus', subdir='aparc')``).
         **kwargs : additional keyword arguments
             These are passed to the underlying