Update platform documentation #64

Job	Run time
common_tests / test-service	2m 31s
check_digit_tests / test-service	2m 23s
hmda_analytics_tests / test-service	2m 35s
hmda_data_publisher_tests / test-service	3m 24s
hmda_platform_tests / test-service	5m 54s
data_browser_tests / test-service	2m 36s
hmda_quarterly_data_service_tests / test-service	2m 20s
hmda_reporting_tests / test-service	2m 37s
institutions_api_tests / test-service	2m 34s
modified_lar_tests / test-service	2m 16s
rate_limit_tests / test-service	2m 16s
ratespread_calculator_tests / test-service	2m 21s
submission_errors_tests / test-service	2m 31s
	36m 18s

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