Update readme - spell check

[ceemafour]

fix typo in readme.md

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespace from that line:

/kind api-change /kind bug /kind cleanup /kind deprecation /kind design

/kind documentation

/kind failing-test /kind feature

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Additional documentation e.g., Vue libraries, usage docs, etc.:

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:tada: This PR is included in version 3.18.1 :tada:

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