Running `dump_format_help.py` in `clang/docs/tools`:
```
warning: line too long:
relative to the current working directory when reading stdin.
warning: line too long:
--files=<filename> - A file containing a list of files to process, one per line.
warning: line too long:
--help-list - Display list of available options (--help-list-hidden for more)
Traceback (most recent call last):
File "/Users/Owen/remove-braces/clang/docs/tools/./dump_format_help.py", line 63, in <module>
contents = substitute(contents, "FORMAT_HELP", help_text)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/Owen/remove-braces/clang/docs/tools/./dump_format_help.py", line 17, in substitute
return re.sub(pattern, "%s", text, flags=re.S) % replacement
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
TypeError: not enough arguments for format string
```
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