docs(templates): clarify usage with render_inline and stages (#370)

content/templates/_index.md

@@ -14,9 +14,7 @@ A template is a pipeline with one to many defined steps that can be sourced into
 Templates can take the form of generalized workflows across repositories or complex workflows like matrices in a single build.
 
 {{% alert color="warning" %}}
-The following YAML tags are not valid inside a template pipeline:
-
-* `stages:`
+Stages can only be utilized within a template if you use the [`render_inline: true` syntax](#rendering-inline-directly-in-velayml).
 {{% /alert %}}
 
 ## Reference documentation