docs(s3-presigned-post): typo in README header

[ocxo]

Description

Fixes typo on https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/modules/_aws_sdk_s3_presigned_post.html

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[aws-sdk-js-automation]

AWS CodeBuild CI Report

• CodeBuild project: sdk-staging-test
• Commit ID: da10f36
• Result: SUCCEEDED
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[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (main@05ef1b4). Click here to learn what that means.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #2095   +/-   ##
=======================================
  Coverage        ?   78.65%           
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  Files           ?      378           
  Lines           ?    16024           
  Branches        ?     3430           
=======================================
  Hits            ?    12603           
  Misses          ?     3421           
  Partials        ?        0           

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