docs: update blue green update document #786

Job	Run time
deployment (static, EmqxEnterprise, emqx-ee, config/samples/emqx/v1beta3/emqxenterprise-slim.yaml)	3m 53s
deployment (static, EmqxEnterprise, emqx-ee, config/samples/emqx/v1beta3/emqxenterprise-full.yaml)	4m 25s
deployment (static, EmqxEnterprise, emqx-ee, config/samples/emqx/v1beta4/emqxenterprise-slim.yaml)	4m 24s
deployment (static, EmqxEnterprise, emqx-ee, config/samples/emqx/v1beta4/emqxenterprise-full.yaml)	4m 14s
deployment (static, EMQX, emqx, config/samples/emqx/v2alpha1/emqx-slim.yaml)	3m 28s
deployment (static, EMQX, emqx, config/samples/emqx/v2alpha1/emqx-full.yaml)	4m 23s
deployment (static, EMQX, emqx, config/samples/emqx/v2beta1/emqx-slim.yaml)	3m 52s
deployment (static, EMQX, emqx, config/samples/emqx/v2beta1/emqx-full.yaml)	4m 48s
deployment (helm, EmqxEnterprise, emqx-ee, config/samples/emqx/v1beta3/emqxenterprise-slim.yaml)	3m 46s
deployment (helm, EmqxEnterprise, emqx-ee, config/samples/emqx/v1beta3/emqxenterprise-full.yaml)	3m 36s
deployment (helm, EmqxEnterprise, emqx-ee, config/samples/emqx/v1beta4/emqxenterprise-slim.yaml)	3m 58s
deployment (helm, EmqxEnterprise, emqx-ee, config/samples/emqx/v1beta4/emqxenterprise-full.yaml)	3m 41s
deployment (helm, EMQX, emqx, config/samples/emqx/v2alpha1/emqx-slim.yaml)	2m 58s
deployment (helm, EMQX, emqx, config/samples/emqx/v2alpha1/emqx-full.yaml)	3m 46s
deployment (helm, EMQX, emqx, config/samples/emqx/v2beta1/emqx-slim.yaml)	3m 14s
deployment (helm, EMQX, emqx, config/samples/emqx/v2beta1/emqx-full.yaml)	3m 57s
	1h 2m 23s

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