docs: note accelerator case insensitivity (#40783)
* Fix PR#38673
As requested in PR#38673 , a line has been added that explicitly states that accelerators are case sensitive
* Update docs/api/accelerator.md
Co-authored-by: Erick Zhao <[email protected]>
* Update accelerator.md
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Co-authored-by: Erick Zhao <[email protected]>