Invalid docstrings when last character of last prop comment is a double quote

Describe your context
MacOS Mojave 10.14.3.

dash                     0.43.0     
dash-core-components     0.48.0     
dash-html-components     0.16.0     
dash-renderer            0.24.0     
dash-table               3.7.0  

Describe the bug

The bug occurs when generating the python class for a custom Dash component using

venv/bin/python -c \"import dash; dash.development.component_loader.generate_classes('galileo_scope_components', 'galileo_scope_components/metadata.json')\"

If the last character of the last comment on the React prop is a double quote, then the python class docstring is invalid. It has four double quotes at the end (the one from the comment, plus 3 closing quotes). Trying to load the class gives a syntax error:

Traceback (most recent call last):
  File "_validate_init.py", line 14, in <module>
    components_lib = importlib.import_module(components_package)
  File "/usr/local/Cellar/python/3.7.3/Frameworks/Python.framework/Versions/3.7/lib/python3.7/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 728, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/Users/david.crawford/src/galileo-scopes/components/galileo_scope_components/__init__.py", line 10, in <module>
    from ._imports_ import *
  File "/Users/david.crawford/src/galileo-scopes/components/galileo_scope_components/_imports_.py", line 4, in <module>
    from .Cloudview import Cloudview
  File "/Users/david.crawford/src/galileo-scopes/components/galileo_scope_components/Cloudview.py", line 35
    - lidarLabel (string; optional): Optional label to distinguish lam2 files, e.g. "VIN000_LIDAR_ROOF_LEFT""""
                                                                                                              ^
SyntaxError: EOL while scanning string literal

Expected behavior

I expect the library to generate valid Python code. In this case I think a newline before the closing quotes (ideally with indentation to match the opening quotes for the docstring) would work.

Screenshots

N/A

Start with dash.development.component_loader.generate_classes and reproduce the issue using the command in the report. Inspect the generated Cloudview.py docstring when the final React prop comment ends in a double quote; done means the generated Python file has valid syntax and can be imported successfully.