DockerHub template examples get --platform

As there are only linux/amd64 images up for each language, the dockerhub
instructions don't work out-of-the-box on Mac machines -- but with the
--platform="linux/amd64" parameter, they will!

Author: frison

.github/bin/overview-template.md

@@ -4,7 +4,7 @@ Check it out on Github! **[100hellos/${lang}](https://github.com/frison/100hello
 
 ## Trying it
 
-`docker run --rm 100hellos/${lang}:latest`
+`docker run --rm --platform="linux/amd64" 100hellos/${lang}:latest`
 
 ## Modifying it
 
@@ -13,7 +13,7 @@ Check it out on Github! **[100hellos/${lang}](https://github.com/frison/100hello
 **or**
 
 ```
-docker run --rm --entrypoint="" -it 100hellos/${lang}:latest zsh
+docker run --rm --platform="linux/amd64" --entrypoint="" -it 100hellos/${lang}:latest zsh
 ```
 
 Check out the `/entrypoint.sh` file on the image to see how it works.