Update path docs

[tiangolo]

📝 Update path docs

[codecov-io]

Codecov Report

Merging #21 into master will increase coverage by 0.06%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #21      +/-   ##
==========================================
+ Coverage   96.92%   96.99%   +0.06%     
==========================================
  Files          96       96              
  Lines        1921     1929       +8     
==========================================
+ Hits         1862     1871       +9     
+ Misses         59       58       -1

Impacted Files	Coverage Δ
...test_parameter_types/test_path/test_tutorial001.py	100% <100%> (ø)	⬆️
docs/src/parameter_types/path/tutorial001.py	100% <100%> (ø)	⬆️
typer/main.py	82.79% <0%> (+0.32%)	⬆️

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