Fix tiny typo

[paulochang]

Data-sly-test stores the original value on the optional attribute AS-IS (no type-casting) involved.

Description

This fixes a small typo in the documentation. "type-cased" was written instead of "type-casted"

Related Issue

??

Motivation and Context

Type casing seems to indicate that the casing of a string would be preserved, in reality, the type is preserved.

How Has This Been Tested?

NA

Screenshots (if appropriate):

Types of changes

• [ X ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] I have signed the Adobe Open Source CLA.
• [X] My code follows the code style of this project.
• [X] My change requires a change to the documentation.
• [X] I have updated the documentation accordingly.
• [X] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.