Correct the spelling of "their" on one of the "Merchandise Workflow" pages.

Brian Sextonrequested to merge
correct-spelling-their-merch-wf-pg into master

This corrects the spelling of "their" at https://about.gitlab.com/handbook/marketing/community-relations/community-advocacy/workflows/merchandise-handling/#check-shopify-inventory.

Note: This does not add punctuation to the sentence as the page overall omits them from sentences in lists.

cc @jjcordz

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