Link helm reference docs on helm installation page

[arkodg]

Description:

Describe the issue.

The Helm installation page https://gateway.envoyproxy.io/latest/install/install-helm/ should have a link to the helm reference docs
https://github.com/envoyproxy/gateway/blob/main/charts/gateway-helm/README.md

[optional Relevant Links:]

Any extra documentation required to understand the issue.

[yuluo-yx]

/assign @yuluo-yx

[shahar-h]

@arkodg there is already a link to helm chart values:

https://gateway.envoyproxy.io/v1.0.1/install/install-helm/#using-valuesyaml-file-for-complex-installation

However, I noticed that values section in chart README.md is not updated.
The reason is only site/content/en/latest/install/api.md is updated when running make helm-readme-gen:

gateway/tools/make/docs.mk

Lines 38 to 42 in c30d09f

	helm-readme-gen: $(tools/helm-docs)
	@$(LOG_TARGET)
	@ImageRepository=docker.io/envoyproxy/gateway ImageTag=latest ImagePullPolicy=IfNotPresent envsubst < charts/gateway-helm/values.tmpl.yaml > ./charts/gateway-helm/values.yaml # use production ENV to generate helm api doc
	$(tools/helm-docs) charts/gateway-helm/ -f values.yaml -o api.md
	mv charts/gateway-helm/api.md site/content/en/latest/install/api.md

[arkodg]

thanks for finding this @shahar-h, looks like the presentation is not ideal, @yuluo-yx can we move the line right after https://gateway.envoyproxy.io/v1.0.1/install/install-helm/#helm-chart-customizations ?

[yuluo-yx]

thanks for finding this @shahar-h, looks like the presentation is not ideal, @yuluo-yx can we move the line right after https://gateway.envoyproxy.io/v1.0.1/install/install-helm/#helm-chart-customizations ?

got it, I will move.

[yuluo-yx]

done. pls review @arkodg