Updated Authentication section to reflect AWX only method. #10505

Job	Run time
api-test	17m 50s
api-migrations	14m 27s
api-lint	5m 29s
api-swagger	8m 58s
dev-env	9m 15s
awx-collection	6m 7s
api-schema	11m 19s
awx-operator	12m 25s
awx_collection integration (a-h, ^[a-h])	16m 35s
awx_collection sanity (stable-2.17)	1m 46s
awx_collection integration (i-p, ^[i-p])	19m 59s
awx_collection integration (r-z0-9, ^[r-z0-9])	18m 51s
combine awx_collection integration coverage	58s
	2h 23m 59s

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