Add release notes for v1.10.2

ci/release_notes.md

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+While the 1.x line concluded with 1.10.1, this release contains a fix that is
+important for upgrading to 2.x if you have a non-standard system domain.  See
+below:
+
+# Bug Fix
+
+* Respect `params.system_domain` from env file when generating TLS
+  certificate SANs. This impacts the SANs for cc_public_tls, logcache_ssl,
+  loggregator_rlp_gateway_tls, loggregator_trafficcontroller_tls,
+  cc_logcache_tls, networ_policy.server_external, router.ssl, haproxy.ssl,
+  autoscaler.servicebroker_public and autoscaler.apiserver_public.
+
+  If `params.system_domain` was set in previous versions, the certs were
+  erroneously created using `system.<base_domain>`.  Run `genesis
+  rotate-secrets -P` to regenerate the certs and deploy.
+