Adds known issue for aarch64 pwd generation

docs/reference/release-notes/8.0.0-rc2.asciidoc

@@ -15,6 +15,27 @@ data loss. If you upgrade from a released version, such as 7.16, to a
 pre-release version for testing, discard the contents of the cluster when you are
 done. Do not attempt to upgrade to the final 8.0 release.
 
+* If you installed {es} from an archive on an aarch64 platform like Linux ARM or macOS M1, the
+`elastic` user password and {kib} enrollment token are not generated
+automatically when starting your node for the first time.
++
+--
+After the node starts, generate the `elastic` password with the
+<<reset-password,`bin/elasticsearch-reset-password`>> tool:
+
+[source,bash]
+----
+bin/elasticsearch-reset-password -u elastic
+----
+
+Then, create an enrollment token for {kib} with the
+<<create-enrollment-token,`bin/elasticsearch-create-enrollment-token`>> tool:
+
+[source,bash]
+----
+bin/elasticsearch-create-enrollment-token -s kibana
+----
+--
 [[deprecation-8.0.0-rc2]]
 [float]
 === Deprecations