[gnome-calculator] Minor fix in history help

[Robert Roth <robertroth src gnome org>]

commit 7abc4d05064548eb9b3233eaef42ce918d3c668b
Author: Robert Roth <robert roth off gmail com>
Date:   Sun Feb 12 09:00:53 2017 +0200

    Minor fix in history help

 help/C/history.page |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/help/C/history.page b/help/C/history.page
index df94ffb..bbc5a69 100644
--- a/help/C/history.page
+++ b/help/C/history.page
@@ -28,7 +28,7 @@
     clicked and scrolled through using a mouse or even navigated and selected
     using the arrow keys on a keyboard. Once an entry has been selected, it
     will immediately show up in the entry box for you to manipulate and use.
-    Finally, there is not an upper limit on the number of calculations that can
+    Finally, there is no upper limit on the number of calculations that can
     show up in the list for you to use.
     </p>
 </page>