docs: Change Generator docs for List Generator to note any key/value…

… pairs can be used (#14825) (#14832)

This is no longer limited to cluster/url value pairs.

Signed-off-by: JesseBot <jessebot@linux.com>
Co-authored-by: JesseBot <jessebot@linux.com>

docs/operator-manual/applicationset/Generators.md

@@ -6,7 +6,7 @@ Generators are primarily based on the data source that they use to generate the
 
 As of this writing there are nine generators:
 
-- [List generator](Generators-List.md): The List generator allows you to target Argo CD Applications to clusters based on a fixed list of cluster name/URL values.
+- [List generator](Generators-List.md): The List generator allows you to target Argo CD Applications to clusters based on a fixed list of any chosen key/value element pairs.
 - [Cluster generator](Generators-Cluster.md): The Cluster generator allows you to target Argo CD Applications to clusters, based on the list of clusters defined within (and managed by) Argo CD (which includes automatically responding to cluster addition/removal events from Argo CD).
 - [Git generator](Generators-Git.md): The Git generator allows you to create Applications based on files within a Git repository, or based on the directory structure of a Git repository.
 - [Matrix generator](Generators-Matrix.md): The Matrix generator may be used to combine the generated parameters of two separate generators.