net/sock : Update documentation

Added net_sock_conf super group and updated sock_util to the super
group.

sys/include/net/sock/util.h

@@ -206,11 +206,9 @@ static inline bool sock_udp_ep_equal(const sock_udp_ep_t *a,
 
 /**
  * @defgroup    net_sock_util_conf SOCK utility functions compile configurations
- * @ingroup     net_sock_util
- * @ingroup     config
+ * @ingroup     net_sock_conf
  * @{
  */
-
 /**
  * @brief maximum length of the scheme part for sock_urlsplit.
  *
@@ -233,7 +231,6 @@ static inline bool sock_udp_ep_equal(const sock_udp_ep_t *a,
 #ifndef CONFIG_SOCK_URLPATH_MAXLEN
 #define CONFIG_SOCK_URLPATH_MAXLEN     (64U)
 #endif
-
 /** @} */
 
 #ifdef __cplusplus

sys/net/sock/doc.txt

@@ -0,0 +1,11 @@
+# Copyright (c) 2020 Freie Universitaet Berlin
+#
+# This file is subject to the terms and conditions of the GNU Lesser
+# General Public License v2.1. See the file LICENSE in the top level
+# directory for more details.
+#
+/**
+ * @defgroup    net_sock_conf SOCK compile configurations
+ * @ingroup     config
+ * @brief       Group of compile time configurations related to SOCK
+ */