docs: fix typo in 06-grpc_rest.md

[taramakage]

Description

Closes: #19174

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[julienrbrt]

Hi! Thanks for this PR, however could you target main instead? We'll backport all the way down.

[taramakage]

Hi! Thanks for this PR, however could you target main instead? We'll backport all the way down.

Yes no problem. I will close this PR and then fork the main branch to make corrections because the PR is based on the release/v0.47.x branch and would result in conflicts when targeting main.