Marco Borgeaud 8729d7a38c
Diff blocks: fix some incorrect use for docker (#2800)
Improvement identified in #2790.

Add a prefix to the diff-id when it is used multiple times in different
"how to fix it in XYZ" sections to avoid ambiguity and pedantically
follow the spec:

> A single and unique diff-id should be used only once for each type of
code example as shown in the description of a rule.

Obvious typos around `diff-id` were fixed.
2023-08-10 15:57:01 +02:00
..