[Doc] Improvement: Fix docs of `ChatMLX` #35695

Job	Run time
build	13s
cd ${{ matrix.job-configs.working-directory }}	0s
cd ${{ matrix.job-configs.working-directory }} / make extended_tests #${{ matrix.job-configs.python-version }}	0s
cd ${{ matrix.job-configs.working-directory }}	0s
cd ${{ matrix.job-configs.working-directory }}	0s
cd . / make lint #3.9	1m 4s
cd . / make lint #3.12	55s
test-doc-imports (3.12) / check doc imports #3.12	59s
CI Success	1s
	3m 12s

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