docs: fix typo
docs: fix typo

Change-Id: Ib84391d68f2147df019109fcee284dda92268c6b
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/48320
Reviewed-by: Keir Mierle <69344103cc60b36d6e1fbdc31ce6504b2286c646@google.com>
Commit-Queue: Keir Mierle <69344103cc60b36d6e1fbdc31ce6504b2286c646@google.com>

google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed