docs: fix typo (culd -> could) - #29412

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I signed it!

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project (if not, look below for help). Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

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CLAs look good, thanks!

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@gkalpak Changed, could you please check it now?

@meriturva, you seem to have added a new commit with the correct message (but leaving the original commit too) and a "merge" commit. You need to squash all three commits into one (and set the correct commit message). See here for instructions.

@gkalpak done. (sorry amend was not enough)

I see that you just added the PR action: merge label, but the following checks are still failing:
     status "ci/circleci: material-unit-tests" is failing
     1 pending code review

If you want your PR to be merged, it has to pass all the CI checks.

If you can't get the PR to a green state due to flakes or broken master, please try rebasing to master and/or restarting the CI job. If that fails and you believe that the issue is not due to your change, please contact the caretaker and ask for help.

merge-assistance: The material-unit-tests failure is unrelated to this PR.

_{(@meriturva, the fix for material-unit-tests has just been merged into master (#29416), so you can also rebase on master to make CI green, if you feel like it 😉)}

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