Add docs for testing, password, version, context. Extra tests, include callback PR

[tiangolo]

✨ Add docs for testing, password, version, context. Extra tests, include callback PR.

[github-actions]

🚀 Deployed on https://5e72745d7f5cb8ff00c5f716--typertiangolo.netlify.com

[github-actions]

🚀 Deployed on https://5e72781920737601741f578a--typertiangolo.netlify.com

[codecov-io]

Codecov Report

Merging #68 into master will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #68      +/-   ##
==========================================
+ Coverage   99.90%   99.92%   +0.01%     
==========================================
  Files         171      210      +39     
  Lines        3313     3933     +620     
==========================================
+ Hits         3310     3930     +620     
  Misses          3        3              

Impacted Files	Coverage Δ
docs/src/options/prompt/tutorial002.py	100.00% <ø> (ø)
tests/test_completion/test_completion.py	97.72% <ø> (ø)
typer/params.py	100.00% <ø> (ø)
docs/src/commands/context/tutorial001.py	100.00% <100.00%> (ø)
docs/src/commands/context/tutorial002.py	100.00% <100.00%> (ø)
docs/src/commands/context/tutorial003.py	100.00% <100.00%> (ø)
docs/src/commands/context/tutorial004.py	100.00% <100.00%> (ø)
docs/src/options/autocompletion/tutorial002.py	100.00% <100.00%> (ø)
docs/src/options/autocompletion/tutorial003.py	100.00% <100.00%> (ø)
docs/src/options/autocompletion/tutorial004.py	100.00% <100.00%> (ø)
... and 75 more

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