Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index 2d3c72e5..bceaec4 100644
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c
@@ -622,7 +622,7 @@
 static void raw_close(struct sock *sk, long timeout)
 {
 	/*
-	 * Raw sockets may have direct kernel refereneces. Kill them.
+	 * Raw sockets may have direct kernel references. Kill them.
 	 */
 	ip_ra_control(sk, 0, NULL);