[Docs] Correcting PR template (#3031)
[Docs] Correcting PR template (#3031)

Correcting PR template to state that the CLA can be signed once a PR is opened.
sigito/material-components-ios,sigito/material-components-ios,randallli/material-components-ios,sigito/material-components-ios,randallli/material-components-ios,material-components/material-components-ios,randallli/material-components-ios,randallli/material-components-ios,material-components/material-components-ios,material-components/material-components-ios,material-components/material-components-ios,sigito/material-components-ios,randallli/material-components-ios,material-components/material-components-ios,randallli/material-components-ios,sigito/material-components-ios