`describe-usage` should handle `peek`

[gregcaporaso]

Currently this block:

:::{describe-usage}
use.peek(emp_single_end_sequences)
:::

Results in this error:

Traceback (most recent call last):
  File "q2doc-plug.py", line 6, in <module>
    myst()
  File "/Users/jgc/miniconda3/envs/amplicon-docs/lib/python3.10/site-packages/click/core.py", line 1157, in __call__
    return self.main(*args, **kwargs)
  File "/Users/jgc/miniconda3/envs/amplicon-docs/lib/python3.10/site-packages/click/core.py", line 1078, in main
    rv = self.invoke(ctx)
  File "/Users/jgc/miniconda3/envs/amplicon-docs/lib/python3.10/site-packages/click/core.py", line 1434, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/Users/jgc/miniconda3/envs/amplicon-docs/lib/python3.10/site-packages/click/core.py", line 783, in invoke
    return __callback(*args, **kwargs)
  File "/Users/jgc/Documents/4-git-repos/qiime2/q2doc/q2doc/__main__.py", line 62, in myst
    print(json.dumps(result, indent=2), flush=True, file=sys.stdout)
  File "/Users/jgc/miniconda3/envs/amplicon-docs/lib/python3.10/json/__init__.py", line 238, in dumps
    **kw).encode(obj)
  File "/Users/jgc/miniconda3/envs/amplicon-docs/lib/python3.10/json/encoder.py", line 201, in encode
    chunks = list(chunks)
  File "/Users/jgc/miniconda3/envs/amplicon-docs/lib/python3.10/json/encoder.py", line 431, in _iterencode
    yield from _iterencode_dict(o, _current_indent_level)
  File "/Users/jgc/miniconda3/envs/amplicon-docs/lib/python3.10/json/encoder.py", line 405, in _iterencode_dict
    yield from chunks
  File "/Users/jgc/miniconda3/envs/amplicon-docs/lib/python3.10/json/encoder.py", line 325, in _iterencode_list
    yield from chunks
  File "/Users/jgc/miniconda3/envs/amplicon-docs/lib/python3.10/json/encoder.py", line 405, in _iterencode_dict
    yield from chunks
  File "/Users/jgc/miniconda3/envs/amplicon-docs/lib/python3.10/json/encoder.py", line 325, in _iterencode_list
    yield from chunks
  File "/Users/jgc/miniconda3/envs/amplicon-docs/lib/python3.10/json/encoder.py", line 405, in _iterencode_dict
    yield from chunks
  File "/Users/jgc/miniconda3/envs/amplicon-docs/lib/python3.10/json/encoder.py", line 325, in _iterencode_list
    yield from chunks
  File "/Users/jgc/miniconda3/envs/amplicon-docs/lib/python3.10/json/encoder.py", line 405, in _iterencode_dict
    yield from chunks
  File "/Users/jgc/miniconda3/envs/amplicon-docs/lib/python3.10/json/encoder.py", line 325, in _iterencode_list
    yield from chunks
  File "/Users/jgc/miniconda3/envs/amplicon-docs/lib/python3.10/json/encoder.py", line 405, in _iterencode_dict
    yield from chunks
  File "/Users/jgc/miniconda3/envs/amplicon-docs/lib/python3.10/json/encoder.py", line 325, in _iterencode_list
    yield from chunks
  File "/Users/jgc/miniconda3/envs/amplicon-docs/lib/python3.10/json/encoder.py", line 405, in _iterencode_dict
    yield from chunks
  File "/Users/jgc/miniconda3/envs/amplicon-docs/lib/python3.10/json/encoder.py", line 438, in _iterencode
    o = _default(o)
  File "/Users/jgc/miniconda3/envs/amplicon-docs/lib/python3.10/json/encoder.py", line 179, in default
    raise TypeError(f'Object of type {o.__class__.__name__} '
TypeError: Object of type UUID is not JSON serializable