[docs] repository plugins: typo fix

[individual-it]

I'm just working on a new plugin and found this tiny typo in the docs

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/docs/apis/commonfiles	🟠 51	🟠 85	🟢 92	🟢 100	🟢 100	Report
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[andrewnicols]

Thanks for that patch. I took the liberty of fixing other copies of the same typo.