docs: Small edits to docs/user-guide/application-set.md (argoproj#1…

…7434)

* Update application-set.md

Signed-off-by: Nate Douglas <ndouglas@users.noreply.github.com>

* Make example code consistent with examples elsewhere.

Signed-off-by: Nathan Douglas <github@darkdell.net>

---------

Signed-off-by: Nate Douglas <ndouglas@users.noreply.github.com>
Signed-off-by: Nathan Douglas <github@darkdell.net>
Signed-off-by: Mangaal <angommeeteimangaal@gmail.com>

docs/user-guide/application-set.md

@@ -1,14 +1,14 @@
 ### Automating the generation of Argo CD Applications with the ApplicationSet Controller
 
-The [ApplicationSet controller](../operator-manual/applicationset/index.md) is a part of Argo CD adds Application automation, and seeks to improve multi-cluster support and cluster multitenant support within Argo CD. Argo CD Applications may be templated from multiple different sources, including from Git or Argo CD's own defined cluster list. 
+The [ApplicationSet controller](../operator-manual/applicationset/index.md) adds Application automation and seeks to improve multi-cluster support and cluster multitenant support within Argo CD. Argo CD Applications may be templated from multiple different sources, including from Git or Argo CD's own defined cluster list.
 
 The set of tools provided by the ApplicationSet controller may also be used to allow developers (without access to the Argo CD namespace) to independently create Applications without cluster-administrator intervention.
 
 !!! warning
     Be aware of the [security implications](../operator-manual/applicationset/Security.md) before allowing developers to
     create Applications via ApplicationSets.
 
-The ApplicationSet controller is installed alongside Argo CD (within the same namespace), and the controller automatically generates Argo CD Applications based on the contents of a new `ApplicationSet` Custom Resource (CR).
+The ApplicationSet controller automatically generates Argo CD Applications based on the contents of an `ApplicationSet` Custom Resource (CR).
 
 Here is an example of an `ApplicationSet` resource that can be used to target an Argo CD Application to multiple clusters:
 ```yaml
@@ -17,6 +17,8 @@ kind: ApplicationSet
 metadata:
   name: guestbook
 spec:
+  goTemplate: true
+  goTemplateOptions: ["missingkey=error"]
   generators:
   - list:
       elements:
@@ -28,15 +30,15 @@ spec:
         url: https://9.8.7.6
   template:
     metadata:
-      name: '{{cluster}}-guestbook'
+      name: '{{.cluster}}-guestbook'
     spec:
-      project: default
+      project: my-project
       source:
-        repoURL: https://github.com/argoproj/argo-cd.git
+        repoURL: https://github.com/infra-team/cluster-deployments.git
         targetRevision: HEAD
-        path: applicationset/examples/list-generator/guestbook/{{cluster}}
+        path: guestbook/{{.cluster}}
       destination:
-        server: '{{url}}'
+        server: '{{.url}}'
         namespace: guestbook
 ```
 
@@ -46,6 +48,4 @@ Likewise, changes made to the ApplicationSet `template` fields will automaticall
 
 Within ApplicationSet there exist other more powerful generators in addition to the List generator, including the Cluster generator (which automatically uses Argo CD-defined clusters to template Applications), and the Git generator (which uses the files/directories of a Git repository to template applications).
 
-To learn more about the ApplicationSet controller, check out [ApplicationSet documentation](../operator-manual/applicationset/index.md) to install the ApplicationSet controller alongside Argo CD.
-
-**Note:** Starting `v2.3` of Argo CD, we don't need to install ApplicationSet Controller separately. It would be instead as part of Argo CD installation.
+To learn more about the ApplicationSet controller, check out the [ApplicationSet documentation](../operator-manual/applicationset/index.md).