Fix typo in introduction.md

assigned to @irisb

Proper labels assigned to this merge request. Please ignore me.

@irisb - please see the following guidance and update this merge request.

	1 Error
	Please add typebug typefeature, or typemaintenance label to this merge request.

added docs-only label

	1 Message
	This merge request adds or changes documentation files and requires Technical Writing review. The review should happen before merge, but can be post-merge if the merge request is time sensitive.

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