BZ2106748: Add a note regarding x509 certificate validatio error

Author: xenolinux

modules/olm-injecting-custom-ca.adoc

@@ -68,3 +68,8 @@ spec:
 <4> `ca-bundle.crt` is required as the config map key.
 <5> `tls-ca-bundle.pem` is required as the config map path.
 <6> Create a `trusted-ca` volume mount.
++
+[NOTE]
+====
+Deployments of an Operator can fail to validate the authority and display a `x509 certificate signed by unknown authority` error. This error can occur even after injecting a custom CA when using the subscription of an Operator. In this case, you can set the `mountPath` as `/etc/ssl/certs` for trusted-ca by using the subscription of an Operator.
+====