docs: fix doc for event stream serde provider

[AllanZhengYP]

Ref: smithy-lang/smithy-typescript#157

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[aws-sdk-js-automation]

AWS CodeBuild CI Report

• CodeBuild project: sdk-staging-test
• Commit ID: d862516
• Result: SUCCEEDED
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[codecov-io]

Codecov Report

Merging #1087 into master will decrease coverage by 12.69%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #1087       +/-   ##
===========================================
- Coverage   91.49%   78.79%   -12.70%     
===========================================
  Files         146      279      +133     
  Lines        2868    11598     +8730     
  Branches      511     2402     +1891     
===========================================
+ Hits         2624     9139     +6515     
- Misses        244     2459     +2215     

Impacted Files	Coverage Δ
packages/smithy-client/src/client.ts	81.81% <0.00%> (-7.66%)	⬇️
packages/util-create-request/src/foo.fixture.ts	73.33% <0.00%> (-5.24%)	⬇️
...l_tests/aws-json/commands/EmptyOperationCommand.ts	100.00% <0.00%> (ø)
...ws-ec2/commands/EmptyInputAndEmptyOutputCommand.ts	100.00% <0.00%> (ø)
...restjson/commands/SimpleScalarPropertiesCommand.ts	100.00% <0.00%> (ø)
...ocol_tests/aws-restxml/commands/XmlListsCommand.ts	100.00% <0.00%> (ø)
...estxml/commands/EmptyInputAndEmptyOutputCommand.ts	100.00% <0.00%> (ø)
protocol_tests/aws-restxml/runtimeConfig.ts	100.00% <0.00%> (ø)
...rotocol_tests/aws-query/commands/XmlMapsCommand.ts	100.00% <0.00%> (ø)
.../aws-restjson/commands/HttpPrefixHeadersCommand.ts	100.00% <0.00%> (ø)
... and 125 more

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