Revise graphviz doc-comments to avoid generating files from rustdoc runs.

Fix #13965.

This commit adopts the second strategy I outlined in #13965, where the bulk of the code is still "smoke tested" (in the sense that rustdoc attempts to run it, sending all of the generated output into a locally allocated `MemWriter`).  The part of the code that is ignored (but included in the presentation) is isolated to a three-line `main` function that invokes the core rendering routine.

In the generated rustdoc output, this leads to a small break between the two code blocks, but I do not think this is a large issue.