Commit dc3765ede5 ("doc: Switch from setenv to env set") was
too eager to switch "setenv" to "env set" and also incorrectly
rewrote "gpt setenv" to "gpt env set". Undo this error.
Fixes: dc3765ede5 ("doc: Switch from setenv to env set")
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Reviewed-by: Simon Glass <sjg@chromium.org>