Fix markup typo on cx demo

Author: johnstegeman

modules/demos/pages/cx-demo.adoc

@@ -61,7 +61,7 @@ Be sure to save the credentials to log in to your database instance. Wait for th
 2. Clone the git repository from  https://github.com/neo4j-product-examples/demo-cx[https://github.com/neo4j-product-examples/demo-cx] You can do this with the following command:
 
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-git clone https://github.com/neo4j-product-examples/demo-cx.git+
+git clone https://github.com/neo4j-product-examples/demo-cx.git
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 Alternatively, you can use the “download ZIP” option on GitHub to download a copy.