If you select Français (Canada) from File > Language in a Google Doc and try to use Talk&Type (Speech Input), you may notice that it doesn’t respond.
Read&Write for Google Chrome’s Talk&Type (Speech Input) uses Google Chrome’s Voice typing which is unavailable for Français (Canada)*. You will see that Chrome's Voice typing is greyed out by going to Tools in the Google Docs menu
You can select Français from File > Language and Voice typing will be available with Talk&Type (Speech Input).
*This is something Google may change at some point, but is beyond our control.