efi_loader: document parameters of do_bootefi_exec()

Add the missing description of the load_options parameter.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/cmd/bootefi.c b/cmd/bootefi.c
index fbfed54..06563d2 100644
--- a/cmd/bootefi.c
+++ b/cmd/bootefi.c
@@ -304,7 +304,11 @@
 /**
  * do_bootefi_exec() - execute EFI binary
  *
+ * The image indicated by @handle is started. When it returns the allocated
+ * memory for the @load_options is freed.
+ *
  * @handle:		handle of loaded image
+ * @load_options:	load options
  * Return:		status code
  *
  * Load the EFI binary into a newly assigned memory unwinding the relocation