[kupfer] User docs: Fix parser error. Still entirely broken due to missing legal.xml

[Andre Klapper <aklapper src gnome org>]

commit b5701c8b1661a39c989bc2af372737d902e3339b
Author: Andre Klapper <a9016009 gmx de>
Date:   Sun Mar 23 22:59:29 2014 +0100

    User docs: Fix parser error. Still entirely broken due to missing legal.xml

 help/C/plugin-calculator.page |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/help/C/plugin-calculator.page b/help/C/plugin-calculator.page
index 78f5e89..d35337a 100644
--- a/help/C/plugin-calculator.page
+++ b/help/C/plugin-calculator.page
@@ -64,7 +64,7 @@
      </list>
      <p>
        The Calculator lets you also calculate expression without "=" on the 
-       beginning as long it have inside one of operators: +, -, *, /, ^, |, &, ~.
+       beginning as long it have inside one of operators: +, -, *, /, ^, |, &amp;, ~.
      </p>
    </section>