Update platform documentation #68

Job	Run time
check_digit_tests / test-service	2m 20s
common_tests / test-service	2m 24s
data_browser_tests / test-service	2m 38s
hmda_analytics_tests / test-service	2m 32s
hmda_data_publisher_tests / test-service	3m 36s
hmda_platform_tests / test-service	5m 45s
hmda_quarterly_data_service_tests / test-service	2m 24s
hmda_reporting_tests / test-service	2m 27s
institutions_api_tests / test-service	2m 21s
rate_limit_tests / test-service	2m 21s
modified_lar_tests / test-service	2m 16s
submission_errors_tests / test-service	2m 20s
ratespread_calculator_tests / test-service	2m 22s
	35m 46s

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