DOC: tweak wording

tacaswell · timhoffm · web-flow · commit e9a6336ebd20 · 2020-02-19T09:14:37.000-05:00
Co-Authored-By: Tim Hoffmann &lt;2836374+timhoffm@users.noreply.github.com&gt;
diff --git a/lib/matplotlib/axes/_axes.py b/lib/matplotlib/axes/_axes.py
@@ -1271,7 +1271,7 @@ def eventplot(self, positions, orientation='horizontal', lineoffsets=1,
             The offset of the center of the lines from the origin, in the
             direction orthogonal to *orientation*.
 
-            If a sequence, then must match the dimension of *positions*
+            A sequence must match the dimension of *positions*
             in the direction of *orientation*.
 
         linelengths : scalar or sequence of scalars, default: 1
