docs/reference/builder: remove outdated example Dockerfiles

These examples were really outdated, so linking to other sections
in the documentation instead.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
(cherry picked from commit 22b14dac8e)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

docs/reference/builder.md

@@ -2356,50 +2356,8 @@ builder with a syntax directive. To learn about these features,
 
 ## Dockerfile examples
 
-Below you can see some examples of Dockerfile syntax.
+For examples of Dockerfiles, refer to:
 
-```dockerfile
-# Nginx
-#
-# VERSION               0.0.1
-
-FROM      ubuntu
-LABEL Description="This image is used to start the foobar executable" Vendor="ACME Products" Version="1.0"
-RUN apt-get update && apt-get install -y inotify-tools nginx apache2 openssh-server
-```
-
-```dockerfile
-# Firefox over VNC
-#
-# VERSION               0.3
-
-FROM ubuntu
-
-# Install vnc, xvfb in order to create a 'fake' display and firefox
-RUN apt-get update && apt-get install -y x11vnc xvfb firefox
-RUN mkdir ~/.vnc
-# Setup a password
-RUN x11vnc -storepasswd 1234 ~/.vnc/passwd
-# Autostart firefox (might not be the best way, but it does the trick)
-RUN bash -c 'echo "firefox" >> /.bashrc'
-
-EXPOSE 5900
-CMD    ["x11vnc", "-forever", "-usepw", "-create"]
-```
-
-```dockerfile
-# Multiple images example
-#
-# VERSION               0.1
-
-FROM ubuntu
-RUN echo foo > bar
-# Will output something like ===> 907ad6c2736f
-
-FROM ubuntu
-RUN echo moo > oink
-# Will output something like ===> 695d7793cbe4
-
-# You'll now have two images, 907ad6c2736f with /bar, and 695d7793cbe4 with
-# /oink.
-```
+- The ["build images" section](https://docs.docker.com/develop/develop-images/dockerfile_best-practices/)
+- The ["get started](https://docs.docker.com/get-started/)
+- The [language-specific getting started guides](https://docs.docker.com/language/)