fixed a typo in command documentation

[omerlh]

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As proposed in #4975

This checklist is used to make sure that common guidelines for a pull request are followed.

General Guidelines

• The PR has modified HISTORY.rst describing any customer-facing, functional changes. Note that this does not include changes only to help content. (see Modifying change log).

Command Guidelines

• Each command and parameter has a meaningful description.
• Each new command has a test.

(see Authoring Command Modules)

[azuresdkci]

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[sptramer]

Looks fixed to me. Sorry I didn't catch the typo in the previous version.