docs: update readme file

Signed-off-by: Otavio Santana <otaviopolianasantana@gmail.com>

Author: otaviojava

README.adoc

@@ -8,8 +8,7 @@ image::http://www.jnosql.org/img/logos/oracle.png[Oracle NoSQL, width=200px]
 == How to install with Docker
 
 1. Install docker: https://www.docker.com/
-2. https://hub.docker.com/_/mongo
-3. Run docker command:
+2. Run docker command:
 
 [source, bash]
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