cramfs: fix help text typo

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/cramfs/Config.in

@@ -1,7 +1,7 @@
 config BR2_PACKAGE_CRAMFS
        bool "cramfs"
        help
-         cramfs is a comporessed read-only filesystem. This package
+         cramfs is a compressed read-only filesystem. This package
          contains the tools to generate and check a cramfs filesystem.
 
-	 http://sourceforge.net/projects/cramfs/
+	 http://sourceforge.net/projects/cramfs/