remove all but one empty line at end of guide

rhaas80 · rhaas80 · commit 404a11b821d6 · 2018-07-01T07:38:34.000-05:00
diff --git a/_extras/guide.md b/_extras/guide.md
@@ -680,29 +680,3 @@ FIXME
 
 [This page](https://matplotlib.org/users/mathtext.html) contains more information.
 
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 [This page](https://matplotlib.org/users/mathtext.html) contains more information.
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