docs(clusterissuer): update guide to show common update (#16382)

**Description**
Updates the set up guide to show how it looks with new common update.

⚒️ Fixes  # 

**⚙️ Type of change**

- [ ] ⚙️ Feature/App addition
- [ ] 🪛 Bugfix
- [ ] ⚠️ Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [ ] 🔃 Refactor of current code

**🧪 How Has This Been Tested?**

**📃 Notes:**

**✔️ Checklist:**

- [ ] ⚖️ My code follows the style guidelines of this project
- [ ] 👀 I have performed a self-review of my own code
- [ ] #️⃣ I have commented my code, particularly in hard-to-understand
areas
- [ ] 📄 I have made corresponding changes to the documentation
- [ ] ⚠️ My changes generate no new warnings
- [ ] 🧪 I have added tests to this description that prove my fix is
effective or that my feature works
- [ ] ⬆️ I increased versions for any altered app according to semantic
versioning

**➕ App addition**

If this PR is an app addition please make sure you have done the
following.

- [ ] 🪞 I have opened a PR on
[truecharts/containers](https://github.com/truecharts/containers) adding
the container to TrueCharts mirror repo.
- [ ] 🖼️ I have added an icon in the Chart's root directory called
`icon.png`

---

_Please don't blindly check all the boxes. Read them and only check
those that apply.
Those checkboxes are there for the reviewer to see what is this all
about and
the status of this PR with a quick glance._

charts/enterprise/clusterissuer/docs/how-to.md

@@ -76,17 +76,12 @@ To be completed
 
 Here's an example on how to add ingress to an app with clusterissuer for a single domain only.
 
-Add the name of the `ACME Issuer` into `Cert-Manager clusterIssuer`
+Add the name of the `ACME Issuer` into `certificateIssuer`
 
-:::warning
-
-Do **NOT** use this combined with the `TLS-Settings`.
-
-:::
 
 ![configure ingress using clusterissuer ](img/clusterissuer-ingressconfig.png)
 
-If you want to support multiple domains on a single app, under `Show Advanced Settings` checkbox, use the `TLS-Settings` option to create each one with the Add button.
+If you want to support multiple domains on a single app, use the Add button next to `Hosts`.
 
 ## Verifying clusterissuer is working