chore: regenerate README

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Log from Synthtool

2021-03-04 16:06:19,495 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-document-ai/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-03-04 16:06:20,422 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

Full log will be available here:
https://source.cloud.google.com/results/invocations/ff16ced3-5f63-49a0-8db3-6f675e456ec9/targets

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[codecov]

Codecov Report

Merging #378 (ae63533) into master (adce60d) will decrease coverage by 11.21%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             master     #378       +/-   ##
=============================================
- Coverage     68.58%   57.37%   -11.22%     
+ Complexity      122      114        -8     
=============================================
  Files            18       18               
  Lines           850      556      -294     
  Branches          4        0        -4     
=============================================
- Hits            583      319      -264     
+ Misses          259      231       -28     
+ Partials          8        6        -2     

Impacted Files	Coverage Δ	Complexity Δ
...ta3/stub/DocumentProcessorServiceStubSettings.java	74.66% <0.00%> (-10.21%)	14.00% <0.00%> (ø%)
...stub/DocumentUnderstandingServiceStubSettings.java	71.92% <0.00%> (-9.38%)	11.00% <0.00%> (ø%)
...stub/DocumentUnderstandingServiceStubSettings.java	73.01% <0.00%> (-8.89%)	12.00% <0.00%> (ø%)
...v1beta3/stub/GrpcDocumentProcessorServiceStub.java	81.25% <0.00%> (-6.93%)	10.00% <0.00%> (-1.00%)
...ta2/stub/GrpcDocumentUnderstandingServiceStub.java	78.94% <0.00%> (-6.56%)	9.00% <0.00%> (-1.00%)
...ta1/stub/GrpcDocumentUnderstandingServiceStub.java	73.33% <0.00%> (-5.84%)	8.00% <0.00%> (ø%)
...ai/v1beta1/DocumentUnderstandingServiceClient.java	40.00% <0.00%> (-3.75%)	6.00% <0.00%> (-1.00%)
...ai/v1beta2/DocumentUnderstandingServiceClient.java	43.75% <0.00%> (-3.31%)	8.00% <0.00%> (-1.00%)
...mentai/v1beta3/DocumentProcessorServiceClient.java	51.11% <0.00%> (-1.84%)	15.00% <0.00%> (-4.00%)
.../v1beta2/DocumentUnderstandingServiceSettings.java	21.87% <0.00%> (+1.87%)	2.00% <0.00%> (ø%)
... and 2 more

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[yoshi-approver]

Rubber stamped PR!