docs: add missing '*' chars at start of doc-comments

gio/gdbusconnection.c

@@ -6126,7 +6126,7 @@ g_dbus_connection_call_finish (GDBusConnection  *connection,
  * operation will fail with %G_IO_ERROR_CANCELLED. If @parameters
  * contains a value not compatible with the D-Bus protocol, the operation
  * fails with %G_IO_ERROR_INVALID_ARGUMENT.
-
+ *
  * If @reply_type is non-%NULL then the reply will be checked for having
  * this type and an error will be raised if it does not match.  Said
  * another way, if you give a @reply_type then any non-%NULL return

gio/gfileenumerator.c

@@ -318,7 +318,7 @@ next_async_callback_wrapper (GObject      *source_object,
  * Request information for a number of files from the enumerator asynchronously.
  * When all i/o for the operation is finished the @callback will be called with
  * the requested information. 
-
+ *
  * See the documentation of #GFileEnumerator for information about the
  * order of returned files.
  *

gio/gvolume.c

@@ -633,7 +633,7 @@ g_volume_enumerate_identifiers (GVolume *volume)
  * then the expression
  * |[<!-- language="C" -->
  *   (g_file_has_prefix (volume_activation_root, mount_root) ||
-      g_file_equal (volume_activation_root, mount_root))
+ *    g_file_equal (volume_activation_root, mount_root))
  * ]|
  * will always be %TRUE.
  *