docs: use "Returns:" consistently

Instead of "Return value:".

gio/gnetworkservice.c

@@ -241,7 +241,7 @@ g_network_service_get_property (GObject    *object,
  * @protocol, and @domain. This will initially be unresolved; use the
  * #GSocketConnectable interface to resolve it.
  *
- * Return value: (transfer full) (type GNetworkService): a new #GNetworkService
+ * Returns: (transfer full) (type GNetworkService): a new #GNetworkService
  *
  * Since: 2.22
  */
@@ -263,7 +263,7 @@ g_network_service_new (const gchar *service,
  *
  * Gets @srv's service name (eg, "ldap").
  *
- * Return value: @srv's service name
+ * Returns: @srv's service name
  *
  * Since: 2.22
  */
@@ -281,7 +281,7 @@ g_network_service_get_service (GNetworkService *srv)
  *
  * Gets @srv's protocol name (eg, "tcp").
  *
- * Return value: @srv's protocol name
+ * Returns: @srv's protocol name
  *
  * Since: 2.22
  */
@@ -300,7 +300,7 @@ g_network_service_get_protocol (GNetworkService *srv)
  * Gets the domain that @srv serves. This might be either UTF-8 or
  * ASCII-encoded, depending on what @srv was created with.
  *
- * Return value: @srv's domain name
+ * Returns: @srv's domain name
  *
  * Since: 2.22
  */
@@ -319,7 +319,7 @@ g_network_service_get_domain (GNetworkService *srv)
  * Get's the URI scheme used to resolve proxies. By default, the service name
  * is used as scheme.
  *
- * Return value: @srv's scheme name
+ * Returns: @srv's scheme name
  *
  * Since: 2.26
  */