Oops! It turns out that #303 modified the behavior of sed() in a way that didn't play nicely with scripts/generate-docs.js. The docs script uses a regex /## Command reference(.|\n)*/, which was previously used to mean "replace everything from '## Command reference' until the very end of the file."

Unix sed, however, does not operate on multiple lines, so it only replaces the first line, leaving all the old docs concatenated onto the end of the new docs.