docs: add helm upgrade instaed of install command (#934)

Author: langchain-infra

docs/self_hosting/installation/kubernetes.mdx

@@ -21,7 +21,15 @@ We've successfully tested LangSmith on the following Kubernetes distributions:
 - Minikube and Kind (for development purposes)
 
 :::note Terraform modules
-We will be releasing Terraform modules the help in the provisioning of resources for LangSmith. You can find those in our [public Terraform repo](https://github.com/langchain-ai/terraform). For example, you can find a LangSmith module for creating AWS resources in the `modules/aws/langsmith` folder within our public Terraform repo.
+We have several Terraform modules the help in the provisioning of resources for LangSmith. You can find those in our [public Terraform repo](https://github.com/langchain-ai/terraform).
+
+Supported cloud providers include:
+
+- [AWS terraform modules](https://github.com/langchain-ai/terraform/tree/main/modules/aws)
+- [Azure terraform modules](https://github.com/langchain-ai/terraform/tree/main/modules/azure)
+
+You can click on the links above to see the documentation for each module. These modules are designed to help you quickly set up the necessary infrastructure for LangSmith, including Kubernetes clusters, storage, and networking.
+
 :::
 
 ## Prerequisites
@@ -139,7 +147,7 @@ Ensure you have the following tools/items ready. Some items are marked optional:
     langchain/langsmith     0.10.10         0.10.29         Helm chart to deploy the langsmith application ...
     ```
 
-1.  Run `helm install langsmith langchain/langsmith --values langsmith_config.yaml --version <version> -n <namespace> --wait --debug`
+1.  Run `helm upgrade -i langsmith langchain/langsmith --values langsmith_config.yaml --version <version> -n <namespace> --wait --debug`
 
     - Replace `<namespace>` with the namespace you want to deploy LangSmith to.
     - Replace `<version>` with the version of LangSmith you want to install from the previous step. Most users should install the latest version available.