Fix typos in the lisp guide

[ebzzry]

No description provided.

[googlebot]

We found a Contributor License Agreement for you (the sender of this pull request), but were unable to find agreements for all the commit author(s) or Co-authors. If you authored these, maybe you used a different email address in the git commits than was used to sign the CLA (login here to double check)? If these were authored by someone else, then they will need to sign a CLA as well, and confirm that they're okay with these being contributed to Google.
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[googlebot]

CLAs look good, thanks!

[phoe]

Is this repository even maintained? This PR has been hanging for almost two years.

[dimo414]

Yes, but it's a too many cooks situation, as each guide is owned internally by a different team. I'll try to ping someone.

[ebzzry]

Thanks for noticing!

[phoe]

Thanks!

[ebzzry]

Thanks!