doc/tutorial: fix typo in 55_defs.txt
Fixes spelling mistake in 55_defs.txt
Fixes #1489
Signed-off-by: Owen Bowers Adams <owen+github@obowersa.net>
Change-Id: I07222f176ae3f6ec7c211ecdfbde1fba9a7a9cff
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/532224
Reviewed-by: Paul Jolly <paul@myitcv.io>
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