docs: error in gitversion execute usage example

[x-delfino]

I think the github actions gitversion instructions were copied from the Azure pipelines example so had the incorrect syntax

[arturcic]

good catch @x-delfino, that is true, both version (GutHub actions and Azure Pipelines task) share most of the code, and we try to keep the docs in sync (usually copy/paste and update)

[mergify]

Thank you @x-delfino for your contribution!