Fix Ubuntu/Java version in .bazelrc comment

Looks like this was just a copy/paste from the `ubuntu1804_java11` config above

Closes #11493.

PiperOrigin-RevId: 313350784
diff --git a/.bazelrc b/.bazelrc
index dace5e0..35e52ce 100644
--- a/.bazelrc
+++ b/.bazelrc
@@ -23,7 +23,7 @@
 build:ubuntu1804_java11 --platforms=//:rbe_ubuntu1804_java11_platform
 build:ubuntu1804_java11 --config=remote_shared
 
-# Configuration to build and test Bazel on RBE on Ubuntu 18.04 with Java 11
+# Configuration to build and test Bazel on RBE on Ubuntu 16.04 with Java 8
 build:ubuntu1604_java8 --host_javabase=@rbe_ubuntu1604_java8//java:jdk
 build:ubuntu1604_java8 --javabase=@rbe_ubuntu1604_java8//java:jdk
 build:ubuntu1604_java8 --host_java_toolchain=@bazel_tools//tools/jdk:toolchain_hostjdk8