Update run-base.md: fix Dockerfile template (#772)

Remove errors in trailing lines

Signed-off-by: GatinMI <marat96g@gmail.com>

content/docs/for-platform-operators/how-to/build-inputs/create-builder/run-base.md

@@ -22,13 +22,13 @@ FROM ubuntu:jammy
 # Install packages that we want to make available at run time
 RUN apt-get update && \
   apt-get install -y xz-utils ca-certificates && \
-  rm -rf /var/lib/apt/lists/* \
+  rm -rf /var/lib/apt/lists/*
 
 # Create user and group
 ARG cnb_uid=1000
 ARG cnb_gid=1000
 RUN groupadd cnb --gid ${cnb_gid} && \
-  useradd --uid ${cnb_uid} --gid ${cnb_gid} -m -s /bin/bash cnb \
+  useradd --uid ${cnb_uid} --gid ${cnb_gid} -m -s /bin/bash cnb
 
 # Set user and group
 USER ${cnb_uid}:${cnb_gid}