libnm: don't use deprecated tags for GOobject introspection

https://bugzilla.gnome.org/show_bug.cgi?id=744250
https://bugzilla.gnome.org/show_bug.cgi?id=794658

libnm/nm-dhcp-config.c

@@ -154,7 +154,7 @@ nm_dhcp_config_class_init (NMDhcpConfigClass *config_class)
 		                   G_PARAM_STATIC_STRINGS));
 
 	/**
-	 * NMDhcpConfig:options: (type GHashTable(utf8,utf8))
+	 * NMDhcpConfig:options: (type GHashTable(utf8,utf8)):
 	 *
 	 * The #GHashTable containing options of the configuration.
 	 **/

libnm/nm-secret-agent-old.c

@@ -882,7 +882,7 @@ nm_secret_agent_old_get_registered (NMSecretAgentOld *self)
 /*****************************************************************************/
 
 /**
- * nm_secret_agent_old_get_secrets:
+ * nm_secret_agent_old_get_secrets: (virtual get_secrets):
  * @self: a #NMSecretAgentOld
  * @connection: the #NMConnection for which we're asked secrets
  * @setting_name: the name of the secret setting
@@ -896,8 +896,6 @@ nm_secret_agent_old_get_registered (NMSecretAgentOld *self)
  * agent should use when performing the request, for example returning only
  * existing secrets without user interaction, or requesting entirely new
  * secrets from the user.
- *
- * Virtual: get_secrets
  */
 void
 nm_secret_agent_old_get_secrets (NMSecretAgentOld *self,
@@ -928,7 +926,7 @@ nm_secret_agent_old_get_secrets (NMSecretAgentOld *self,
 }
 
 /**
- * nm_secret_agent_old_save_secrets:
+ * nm_secret_agent_old_save_secrets: (virtual save_secrets):
  * @self: a #NMSecretAgentOld
  * @connection: a #NMConnection
  * @callback: (scope async): a callback, to be invoked when the operation is done
@@ -936,8 +934,6 @@ nm_secret_agent_old_get_secrets (NMSecretAgentOld *self,
  *
  * Asynchronously ensures that all secrets inside @connection are stored to
  * disk.
- *
- * Virtual: save_secrets
  */
 void
 nm_secret_agent_old_save_secrets (NMSecretAgentOld *self,
@@ -957,7 +953,7 @@ nm_secret_agent_old_save_secrets (NMSecretAgentOld *self,
 }
 
 /**
- * nm_secret_agent_old_delete_secrets:
+ * nm_secret_agent_old_delete_secrets: (virtual delete_secrets):
  * @self: a #NMSecretAgentOld
  * @connection: a #NMConnection
  * @callback: (scope async): a callback, to be invoked when the operation is done
@@ -965,8 +961,6 @@ nm_secret_agent_old_save_secrets (NMSecretAgentOld *self,
  *
  * Asynchronously asks the agent to delete all saved secrets belonging to
  * @connection.
- *
- * Virtual: delete_secrets
  */
 void
 nm_secret_agent_old_delete_secrets (NMSecretAgentOld *self,