[gcalctool] Update help to new memory button

[Robert Ancell <rancell src gnome org>]

commit 239944aac8d495f127c3343f033497892d89d912
Author: Robert Ancell <robert ancell canonical com>
Date:   Wed Jan 5 15:04:35 2011 +1100

    Update help to new memory button

 help/C/variables.page |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/help/C/variables.page b/help/C/variables.page
index 16c5bba..148c017 100644
--- a/help/C/variables.page
+++ b/help/C/variables.page
@@ -9,7 +9,7 @@
 	<title>Variables</title>
     
     <p>
-    To assign a value to a variable use the = symbol or choose the variable to assign to with the <gui>â??R</gui> button in <link xref="mouse">advanced mode</link>.
+    To assign a value to a variable use the = symbol or choose the variable to assign to with the <gui>x</gui> button in <link xref="mouse">advanced mode</link>.
     A variable name must only contain upper or lower characters.
     </p>
     <example>
@@ -22,7 +22,7 @@
     </example>
     <p>
     Variables can be used in any equation and are substituted for their assigned value.
-    Variables can be inserted using the <gui>â??R</gui> button.
+    Variables can be inserted using the <gui>x</gui> button.
     </p>
     <example>
     <p>