docs(awscore): Update JavaDoc for AwsServiceException

[risto-liftoff]

Motivation and Context

I noticed the documentation for AwsServiceException references errorType which doesn't exist on the class. This appears to be a copy-paste artifact from v1 of the SDK.

Modifications

Removes the incorrect sentence.

Testing

Did not test

Screenshots (if appropriate)

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)

Checklist

• [x] I have read the CONTRIBUTING document
• [ ] Local run of mvn install succeeds
• [x] My code follows the code style of this project
• [ ] My change requires a change to the Javadoc documentation
• [x] I have updated the Javadoc documentation accordingly
• [ ] I have added tests to cover my changes
• [ ] All new and existing tests passed
• [ ] I have added a changelog entry. Adding a new entry must be accomplished by running the scripts/new-change script and following the instructions. Commit the new file created by the script in .changes/next-release with your changes.
• [ ] My change is to implement 1.11 parity feature and I have updated LaunchChangelog

License

• [x] I confirm that this pull request can be released under the Apache 2 license