Fix comments on dockerfiles.

Author: maraino

Diff for: examples/docker/ca/Dockerfile

@@ -3,5 +3,5 @@ FROM alpine
 ADD step-ca /usr/local/bin/step-ca
 COPY pki /run
 
-# Cron && Nginx
+# Smallstep CA
 CMD ["step-ca", "/run/config/ca.json"]

Diff for: examples/docker/nginx/Dockerfile

@@ -6,6 +6,6 @@ COPY site.conf /etc/nginx/conf.d/
 COPY certwatch.sh /
 COPY entrypoint.sh /
 
-# Cron && Nginx
+# Certificate watcher and nginx
 ENTRYPOINT ["/entrypoint.sh"]
 CMD ["nginx", "-g", "daemon off;"]