bloblist: Update documentation and header comment

Align the documentation with the v0.9 spec.

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Raymond Mao <raymond.mao@linaro.org>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
diff --git a/doc/develop/bloblist.rst b/doc/develop/bloblist.rst
index 81643c7..2843103 100644
--- a/doc/develop/bloblist.rst
+++ b/doc/develop/bloblist.rst
@@ -14,6 +14,8 @@
 For the design goals of bloblist, please see the comments at the top of the
 `bloblist.h` header file.
 
+Bloblist is an implementation with the `Firmware Handoff`_ protocol.
+
 Passing state through the boot process
 --------------------------------------
 
@@ -99,7 +101,7 @@
 -----------------
 
 .. kernel-doc:: include/bloblist.h
-
+.. _`Firmware Handoff`: https://github.com/FirmwareHandoff/firmware_handoff
 
 Simon Glass
 sjg@chromium.org