fmt: trailing whitespace fixes

[nhooyr]

No description provided.

[nhooyr]

@alixander

./ci/render.sh text

./ci/render.sh /mmdc

./ci/render.sh text/d2

[nhooyr]

This also adds ./src/examples/10_wiiu/render/mermaid_dagre.svg as the latest version of mermaid is able to compile fine.

before we were showing the error:

Compile error: On the latest version of Mermaid CLI, the text returns a mysterious "Error: Evaluation failed: Error: Unknown mermaid render error". On mermaid.live, the same text renders fine.

[nhooyr]

Also see #34, won't run render.sh in CI for now.