Auto generated docs are **NO LONGER CHECKED IN**, only placeholders.
To generate them, e.g. before exporting docs, run hack/generate-docs.sh.
hack/verify-generated-docs.sh ensures that generated docs are merely the
placeholder text.
hack/update-generated-docs.sh puts the placeholder text in the proper
places.
The old munge behavior is moved into hack/{update|verify}-munge-docs.sh.