DOC: update RFC references

A few doc and code comment updates bumping RFC references to the new
ones.
diff --git a/src/haproxy.c b/src/haproxy.c
index 02f90a8..261b213 100644
--- a/src/haproxy.c
+++ b/src/haproxy.c
@@ -7,8 +7,8 @@
  * as published by the Free Software Foundation; either version
  * 2 of the License, or (at your option) any later version.
  *
- * Please refer to RFC2068 or RFC2616 for informations about HTTP protocol, and
- * RFC2965 for informations about cookies usage. More generally, the IETF HTTP
+ * Please refer to RFC7230 - RFC7235 informations about HTTP protocol, and
+ * RFC6265 for informations about cookies usage. More generally, the IETF HTTP
  * Working Group's web site should be consulted for protocol related changes :
  *
  *     http://ftp.ics.uci.edu/pub/ietf/http/
diff --git a/src/proto_http.c b/src/proto_http.c
index 579473b..53bfd8b 100644
--- a/src/proto_http.c
+++ b/src/proto_http.c
@@ -850,8 +850,8 @@
 	return 0;
 }
 
-/* Find the end of the header value contained between <s> and <e>. See RFC2616,
- * par 2.2 for more information. Note that it requires a valid header to return
+/* Find the end of the header value contained between <s> and <e>. See RFC7230,
+ * par 3.2 for more information. Note that it requires a valid header to return
  * a valid result. This works for headers defined as comma-separated lists.
  */
 char *find_hdr_value_end(char *s, const char *e)
@@ -1119,7 +1119,7 @@
 	if (ptr >= end)
 		return NULL;
 
-	/* RFC2616, par. 5.1.2 :
+	/* RFC7230, par. 2.7 :
 	 * Request-URI = "*" | absuri | abspath | authority
 	 */