chore: add superuser requirement (#185)

Author: Katie Horne

setup/installation.md

@@ -67,8 +67,9 @@ kubectl config set-context --current --namespace=coder
       coder coder/coder -n coder --version=<VERSION> -f values.yaml`. **This
       must be done for whenever you update the helm chart.**
 
-4. Add the following to your helm chart so that Coder uses your external
-   PostgreSQL databases:
+4. Ensure that you have superuser privileges to your PostgreSQL database. Add
+   the following to your helm chart so that Coder uses your external PostgreSQL
+   databases:
 
    ```yaml
    postgres:

setup/updating.md

@@ -7,26 +7,25 @@ This guide will show you how to update your Coder deployment.
 
 ## Prerequisites
 
-If you haven't already, install [helm](https://helm.sh/docs/intro/install/).
+- If you haven't already, install [helm](https://helm.sh/docs/intro/install/).
 
-Before beginning the update process, please make sure that you've added the
-Coder helm repo to your cluster. You can verify that the Coder repo has been
-added to helm using `helm repo list`:
+- Before beginning the update process, ensure that you've added the Coder helm
+  repo to your cluster. You can verify that the Coder repo has been added to
+  helm using `helm repo list`:
 
-```console
-$ helm repo list
-NAME URL
-coder https://helm.coder.com
-```
+  ```console
+  $ helm repo list
+  NAME URL
+  coder https://helm.coder.com
+  ```
 
-If you don't have the Coder repo, you can add it:
+  If you don't have the Coder repo, you can add it:
 
-```console
-helm repo add coder https://helm.coder.com
-```
+  ```console
+  helm repo add coder https://helm.coder.com
+  ```
 
-Please also ensure that your Kubernetes config is pointing to the cluster on
-which you've deployed Coder.
+- Ensure that you have superuser privileges to your PostgreSQL database.
 
 ## Recommendations