fixes spelling error. metod = method

[alexmgrant]

Checklist

• Issue number for this PR: N/A
• Docs included?: N/A
• Test units included?: no
• In a clean directory, npm install, npm run build, and npm test run successfully?: yes

Description

This is a simple spelling fix. Changes an instance of metod to method. Only this documentation was edited.

Code sample

N/A

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We found a Contributor License Agreement for you (the sender of this pull request), but were unable to find agreements for the commit author(s). 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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[jamesdaniels]

Thanks