DOCSP-29509: correct x.509 warning (#5031) (#5032)

Author: jwilliams-mongo

source/includes/fact-warn-disable-x509-member-cert.rst

@@ -4,8 +4,7 @@
    If you enable x.509 member certificate authentication for any 
    deployment in a project, you can't disable x.509 member certificate 
    authentication for the deployment or disable 
-   x.509 client authentication at the project level. The project must 
-   use x.509 client authentication.
+   x.509 client authentication at the project level.
 
    Enabling x.509 member certificate authentication for a deployment in
    a project doesn't enable or require x.509 member certificate