docs: document client credentials authentication flow (#422) #25

Job	Run time
build-wheels	0s
discover-packages	0s
${{ matrix.package }} / py${{ matrix.python-version }} / ${{ matrix.os }}	0s
discover-testcases	-1s
${{ matrix.package }} / ${{ matrix.testcase }} / ${{ matrix.environment }}	-1s
notify-on-failure	0s
	-2s

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