[ghex] Fix two spelling errors in source comments

[Kalev Lember <klember src gnome org>]

commit 34d1a0659a8282d6fcac690a47b2b903ab612ad4
Author: Martin Olsson <martin minimum se>
Date:   Sat Sep 29 18:47:23 2012 +0200

    Fix two spelling errors in source comments

 autogen.sh   |    2 +-
 src/gtkhex.h |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/autogen.sh b/autogen.sh
index 8d055cf..56ffd6b 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -15,7 +15,7 @@ PKG_NAME="GHex"
     exit 1
 }
 
-# Check for gnome-autogen.sh existance
+# Check for gnome-autogen.sh existence
 which gnome-autogen.sh || {
     echo "You need to install gnome-common from GNOME Git (or from"
     echo "your OS vendor's package manager)."
diff --git a/src/gtkhex.h b/src/gtkhex.h
index b916f43..f43392f 100644
--- a/src/gtkhex.h
+++ b/src/gtkhex.h
@@ -65,7 +65,7 @@ struct _GtkHex_Highlight
 	gboolean valid;
 };
 
-/* used to automatically highlight all visible occurances
+/* used to automatically highlight all visible occurrences
  * of the string.
  */
 typedef struct _GtkHex_AutoHighlight GtkHex_AutoHighlight;