If your corporate rules require to disable access to docs.com service, you have just to follow the instructions you can find in the following support article:
Basically, you can control access to docs.com service by enabling/disabling it at Azure AD (using both the UI or PowerShell command line).
Reference: https://techcommunity.microsoft.com/t5/Office-365/Stop-access-to-Docs-com/m-p/26313#M1022