[gnome-calculator] docs: Fix typos where subscript linked to superscript

[Michael Catanzaro <mcatanzaro src gnome org>]

commit e3104233b3983bc2d235b3fe9504a10f93255cc0
Author: Sebastian Rasmussen <sebras gmail com>
Date:   Sat Mar 7 00:17:32 2015 +0100

    docs: Fix typos where subscript linked to superscript
    
    Fixes https://bugzilla.gnome.org/show_bug.cgi?id=745764

 help/C/base.page  |    2 +-
 help/C/power.page |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/help/C/base.page b/help/C/base.page
index 614c679..b1965df 100644
--- a/help/C/base.page
+++ b/help/C/base.page
@@ -9,7 +9,7 @@
        <title>Number Bases</title>
     
     <p>
-    To enter numbers in a particular number base use <link xref="superscript">subscript numbers</link>.
+    To enter numbers in a particular number base use <link xref="subscript">subscript numbers</link>.
     The following numbers are equivalent.
     </p>
     <example>
diff --git a/help/C/power.page b/help/C/power.page
index 241c209..7e12c3b 100644
--- a/help/C/power.page
+++ b/help/C/power.page
@@ -55,7 +55,7 @@
   </example>
 
   <p>n-th roots can be calculated by putting a
-  <link xref="superscript">subscript number</link> before the root sign.</p>
+  <link xref="subscript">subscript number</link> before the root sign.</p>
 
   <example>
     <p>₃√2</p>