Coccinelle: Update information about the minimal version required

The naming convention of options has changed one year ago.
The options have been recently updated in the cocci file
and in scripts/coccicheck. This patch also adds this information
in the documentation.

Signed-off-by: Nicolas Palix <nicolas.palix@imag.fr>
Signed-off-by: Michal Marek <mmarek@suse.cz>
diff --git a/scripts/coccicheck b/scripts/coccicheck
index d3757ad..bbf901a 100755
--- a/scripts/coccicheck
+++ b/scripts/coccicheck
@@ -1,5 +1,10 @@
 #!/bin/bash
 
+#
+# This script requires at least spatch
+# version 1.0.0-rc11.
+#
+
 SPATCH="`which ${SPATCH:=spatch}`"
 
 trap kill_running SIGTERM SIGINT