Remove a useless '\' and enhance a script in an example in the section 'Add entries ... (--add-host)'

Signed-off-by: Abreto FU <public@abreto.email>
(cherry picked from commit 07436dfe78e293507adfbf82ffea1ad6e6605c34)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Upstream-commit: 2d6231ad4d33d6b70c39c2b4b7ecc005599c0d80
Component: cli

Author: Abreto

components/cli/docs/reference/commandline/run.md

@@ -689,7 +689,7 @@ using IPv4 or IPv6 networking in your containers. Use the following
 flags for IPv4 address retrieval for a network device named `eth0`:
 
 ```bash
-$ HOSTIP=`ip -4 addr show scope global dev eth0 | grep inet | awk '{print \$2}' | cut -d / -f 1`
+$ HOSTIP=`ip -4 addr show scope global dev eth0 | grep inet | awk '{print $2}' | cut -d / -f 1 | sed -n 1p`
 $ docker run  --add-host=docker:${HOSTIP} --rm -it debian
 ```