Here is a proposed patch to both docs and help output.  The help output now looks like this:

usage: compileall.py [-h] [-l] [-f] [-q] [-b] [-d DESTDIR] [-x REGEXP]
                     [-i FILE]
                     [FILE|DIR [FILE|DIR ...]]

Utilities to support installing Python libraries.

positional arguments:
  FILE|DIR    zero or more file and directory names to compile; if no
              arguments given, defaults to the equivalent of -l sys.path

optional arguments:
  -h, --help  show this help message and exit
  -l          don't recurse into subdirectories
  -f          force rebuild even if timestamps are up to date
  -q          output only error messages
  -b          use legacy (pre-PEP3147) compiled file locations
  -d DESTDIR  directory to prepend to file paths for use in compile time
              tracebacks and in runtime tracebacks in cases where the source
              file is unavailable
  -x REGEXP   skip files matching the regular expression. The regexp is
              searched for in the full path to each file considered for
              compilation.
  -i FILE     add all the files and directories listed in FILE to the list
              considered for compilation. If "-", names are read from stdin.