doc: imx: psb: fix footnotes
In reStructured text footnotes are referenced like [1]_.
Add missing underscores.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Acked-by: Marek Vasut <marex@denx.de>
diff --git a/doc/imx/misc/psb.rst b/doc/imx/misc/psb.rst
index 4d6f001..9bb84b4 100644
--- a/doc/imx/misc/psb.rst
+++ b/doc/imx/misc/psb.rst
@@ -88,7 +88,7 @@
SIT is a 20 byte long structure containing of 5 32-bit words. Those encode
bootloader B-copy area offset (called "firstSectorNumber"), magic value
(called "tag") that is always 0x00112233, and three unused words set to 0.
-SIT is documented in [1] and [2]. Example SIT are below::
+SIT is documented in [1]_ and [2]_. Example SIT are below::
$ hexdump -vC sit-mx7d.bin
00000000 00 00 00 00