change directml to dml in README code example for execution provider

[BobJr23]

Update README to use correct DirectML execution provider argument (dml)

Summary by Sourcery

Correct the execution provider name in the README.md usage instructions from 'directml' to 'dml'.

Documentation:

• Update the README.md to correct the execution provider name from 'directml' to 'dml' in the usage instructions.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request updates the README.md file to correct the execution provider argument for DirectML. The change replaces 'directml' with 'dml' in the command-line example, as 'directml' doesn't work.

File-Level Changes

Files	Changes
README.md	Updated the command-line argument for the DirectML execution provider from 'directml' to 'dml'

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[sourcery-ai]

Hey @BobJr23 - I've reviewed your changes - here's some feedback:

Overall Comments:

• The change looks good, but consider improving the commit message to be more specific. Instead of 'directml doesn't work', it would be clearer to say something like 'Update README to use correct DirectML execution provider argument (dml)'.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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