res: Fix for Doxygen.

These are the remaining issues found in /res.

ASTERISK-29761

Change-Id: I572e6019c422780dde5ce8448b6c85c77af6046d

res/prometheus/bridges.c

@@ -37,7 +37,7 @@
  * \brief Callback function to get the number of channels in a bridge
  *
  * \param metric The metric to populate
- * \snapshot Bridge snapshot
+ * \param snapshot Bridge snapshot
  */
 static void get_bridge_channel_count(struct prometheus_metric *metric, struct ast_bridge_snapshot *snapshot)
 {

res/prometheus/channels.c

@@ -40,7 +40,7 @@
  * \brief Callback function to get a channel's current state
  *
  * \param metric The metric to populate
- * \snapshot Channel snapshot
+ * \param snapshot Channel snapshot
  */
 static void get_channel_state(struct prometheus_metric *metric, struct ast_channel_snapshot *snapshot)
 {

res/prometheus/endpoints.c

@@ -39,7 +39,7 @@
  * \brief Callback function to get an endpoint's current state
  *
  * \param metric The metric to populate
- * \snapshot Endpoint snapshot
+ * \param snapshot Endpoint snapshot
  */
 static void get_endpoint_state(struct prometheus_metric *metric, struct ast_endpoint_snapshot *snapshot)
 {

res/prometheus/pjsip_outbound_registrations.c

@@ -64,8 +64,6 @@ struct prometheus_metric_wrapper {
 	char key[128];
 };
 
-AST_MUTEX_DEFINE_STATIC(metrics_lock);
-
 /*!
  * \internal Vector of metric wrappers
  *
@@ -77,6 +75,8 @@ AST_MUTEX_DEFINE_STATIC(metrics_lock);
  */
 static AST_VECTOR(, struct prometheus_metric_wrapper *) metrics;
 
+AST_MUTEX_DEFINE_STATIC(metrics_lock);
+
 /*!
  * \internal
  * \brief Create a wrapper for a metric given a key