chore: regenerate README

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Log from Synthtool

2020-10-27 19:30:31,327 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-document-ai/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working directory clean
2020-10-27 19:30:32,278 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

Full log will be available here:
https://source.cloud.google.com/results/invocations/41e9caf7-1bd4-46a1-b041-324d3294df9e/targets

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[yoshi-approver]

Rubber stamped PR!

[codecov]

Codecov Report

Merging #244 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #244   +/-   ##
=========================================
  Coverage     68.22%   68.22%           
  Complexity      118      118           
=========================================
  Files            18       18           
  Lines           853      853           
  Branches          4        4           
=========================================
  Hits            582      582           
  Misses          263      263           
  Partials          8        8           

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