Updated command instructions with examples for rad_install_kubernetes…

….md page (#7988)

# Description

Enhanced examples with different arguments for 'rad install kubernetes'
command requested in
#7968

## Type of change

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- This pull request is a minor refactor, code cleanup, test improvement,
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Fixes: #7968 

## Contributor checklist
Please verify that the PR meets the following requirements, where
applicable:

- [ ] An overview of proposed schema changes is included in a linked
GitHub issue.
- [ ] A design document PR is created in the [design-notes
repository](https://github.com/radius-project/design-notes/), if new
APIs are being introduced.
- [ ] If applicable, design document has been reviewed and approved by
Radius maintainers/approvers.
- [ ] A PR for the [samples
repository](https://github.com/radius-project/samples) is created, if
existing samples are affected by the changes in this PR.
- [X] A PR for the [documentation
repository](https://github.com/radius-project/docs) is created, if the
changes in this PR affect the documentation or any user facing updates
are made.
- [ ] A PR for the [recipes
repository](https://github.com/radius-project/recipes) is created, if
existing recipes are affected by the changes in this PR.

---------

Signed-off-by: Chintan Anilkumar Kansara <[email protected]>
Signed-off-by: ckansara16 <[email protected]>
Co-authored-by: Reshma Abdul Rahim <[email protected]>

pkg/cli/cmd/install/kubernetes/kubernetes.go

@@ -56,6 +56,18 @@ rad install kubernetes --set key=value
 
 # Install Radius with the intermediate root CA certificate in the current Kubernetes context
 rad install kubernetes --set-file global.rootCA.cert=/path/to/rootCA.crt
+
+# Install Radius with zipkin server for distributed tracing 
+rad install kubernetes --set global.zipkin.url=http://localhost:9411/api/v2/spans
+
+# Install Radius with central prometheus monitoring service
+rad install kubernetes --set global.prometheus.path=/customdomain.com/metrics,global.prometheus.port=443,global.rootCA.cert=/path/to/rootCA.crt 
+
+# Install Radius using a helmchart from specified file path
+rad install kubernetes --chart /root/radius/deploy/Chart
+
+# Force re-install Radius with latest version
+rad install kubernetes --reinstall
 `,
 		Args: cobra.ExactArgs(0),
 		RunE: framework.RunCommand(runner),