Merge pull request matplotlib#4374 from jenshnielsen/errorbar_docs

DOC : fix typo in errorbar docs

Author: tacaswell

lib/matplotlib/axes/_axes.py

@@ -2661,7 +2661,7 @@ def errorbar(self, x, y, yerr=None, xerr=None,
             before :meth:`errorbar`.
 
           *errorevery*: positive integer
-            subsamples the errorbars. e.g., if everyerror=5, errorbars for
+            subsamples the errorbars. e.g., if errorevery=5, errorbars for
             every 5-th datapoint will be plotted. The data plot itself still
             shows all data points.