docs: update code-hints for compatibility with "rouge"
Unlike GitHub's web-UI, the "rouge" hightlighter used in our online documentation is case-sensitive. As a result, code-blocks having the Dockerfile (uppercase) code-hint were not highlighted. This changes those to use lowercase, which is supported by both. Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
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@ -167,7 +167,7 @@ Status: Downloaded newer image for ubuntu@sha256:45b23dee08af5e43a7fea6c4cf9c25c
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Digest can also be used in the `FROM` of a Dockerfile, for example:
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```Dockerfile
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```dockerfile
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FROM ubuntu@sha256:45b23dee08af5e43a7fea6c4cf9c25ccf269ee113168c19722f87876677c5cb2
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MAINTAINER some maintainer <maintainer@example.com>
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```
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