doc: imx: psb: fix footnotes
In reStructured text footnotes are referenced like [1]_. Add missing underscores. Signed-off-by: NHeinrich Schuchardt <xypron.glpk@gmx.de> Acked-by: NMarek Vasut <marex@denx.de>
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In reStructured text footnotes are referenced like [1]_. Add missing underscores. Signed-off-by: NHeinrich Schuchardt <xypron.glpk@gmx.de> Acked-by: NMarek Vasut <marex@denx.de>