Fix DeprecationWarning [INFO] while generating docs

[harishmohanraj]

INFO - DeprecationWarning: invalid escape sequence '\s'
File "/Users/harishm/.pyenv/versions/3.10.4/lib/python3.10/site-packages/griffe/agents/visitor.py", line 174, in get_module
top_node = compile(self.code, mode="exec", filename=str(self.filepath), flags=ast.PyCF_ONLY_AST, optimize=1)
File "nbdev_mkdocs/docstring.py", line 94, in
code = [x[0] for x in re.findall("\s*python((\n|.|\\n])+)", s)]
INFO - DeprecationWarning: invalid escape sequence '\w'
File "/Users/harishm/.pyenv/versions/3.10.4/lib/python3.10/site-packages/griffe/agents/visitor.py", line 174, in get_module
top_node = compile(self.code, mode="exec", filename=str(self.filepath), flags=ast.PyCF_ONLY_AST, optimize=1)
File "nbdev_mkdocs/docstring.py", line 124, in
[x[9:-1] for x in re.findall("{fill in \w+}", example)]
INFO - DeprecationWarning: invalid escape sequence '{'
File "/Users/harishm/.pyenv/versions/3.10.4/lib/python3.10/site-packages/griffe/agents/visitor.py", line 174, in get_module
top_node = compile(self.code, mode="exec", filename=str(self.filepath), flags=ast.PyCF_ONLY_AST, optimize=1)
File "nbdev_mkdocs/mkdocs.py", line 116, in
keys = [s[1:-1] for s in re.findall("{.*?}", _mkdocs_template)]
INFO - Documentation built in 1.18 seconds