docs(clients): add missing await for client.operationName call

[trivikr]

Issue

Fixes: #2231

Description

Adds missing await for client.operationName call in README

Testing

Verified that missing await is added in README

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[aws-sdk-js-automation]

AWS CodeBuild CI Report

• CodeBuild project: sdk-staging-test
• Commit ID: 62b375d
• Result: SUCCEEDED
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Codecov Report

❗ No coverage uploaded for pull request base (main@d6a67d7). Click here to learn what that means.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #2243   +/-   ##
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  Coverage        ?   61.83%           
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  Files           ?      453           
  Lines           ?    23289           
  Branches        ?     5519           
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  Hits            ?    14401           
  Misses          ?     8888           
  Partials        ?        0           

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[pratikpc]

@trivikr it would be nice if we could have better examples too

For example, for AWS SES, I had to go to https://docs.aws.amazon.com/sdk-for-javascript/v3/developer-guide/ses-examples-sending-email.html to find out how to send EMails which I think should be the focus of AWS SES docs

[trivikr]

it would be nice if we could have better examples too

For example, for AWS SES, I had to go to docs.aws.amazon.com/sdk-for-javascript/v3/developer-guide/ses-examples-sending-email.html to find out how to send EMails which I think should be the focus of AWS SES docs

The current README.md has auto generated examples.
We're working on improved API Reference story, where specific examples related to service would be added.

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