Backport PR #28400 on branch 0.25.x (Fix a typo in "computation.rst" in document.)
Manually backporting #28400 since the bot isn't responding; did a cherry-pick of 6d47fabaf94d7427b48b30a3808545738cd778c6.  This should fix the failing doc builds on the 0.25.x branch.

Thanks @jschendel 