Update default API title from "Fast API" to "FastAPI" for consistency

[tiangolo]

♻️ Update default API title from "Fast API" to "FastAPI" for consistency.

[codecov]

Codecov Report

Merging #890 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #890   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files         293    293           
  Lines        7692   7692           
=====================================
  Hits         7692   7692

Impacted Files	Coverage Δ
tests/test_additional_properties.py	100% <ø> (ø)	⬆️
...sts/test_tutorial/test_testing/test_tutorial001.py	100% <ø> (ø)	⬆️
tests/test_security_http_base_optional.py	100% <ø> (ø)	⬆️
...est_additional_responses_custom_validationerror.py	100% <ø> (ø)	⬆️
...est_tutorial/test_extra_models/test_tutorial004.py	100% <ø> (ø)	⬆️
..._sql_databases_peewee/test_sql_databases_peewee.py	100% <ø> (ø)	⬆️
tests/test_security_openid_connect_optional.py	100% <ø> (ø)	⬆️
tests/test_additional_response_extra.py	100% <ø> (ø)	⬆️
..._tutorial/test_handling_errors/test_tutorial001.py	100% <ø> (ø)	⬆️
...ts/test_tutorial/test_security/test_tutorial005.py	100% <ø> (ø)	⬆️
... and 99 more

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