Update Next.js sample config - layoutServiceConfiguration="default" (#…

…722)

* Update Next.js sample config - layoutServiceConfiguration="default"

* Update samples/nextjs/sitecore/config/JssNextWeb.config

Co-authored-by: Adam Brauer <400763+ambrauer@users.noreply.github.com>

Co-authored-by: Adam Brauer <400763+ambrauer@users.noreply.github.com>

samples/nextjs/sitecore/config/JssNextWeb.config

@@ -81,8 +81,14 @@
           Defaults are defined in `/App_Config/Sitecore/JavaScriptServices/Sitecore.JavaScriptServices.Apps.config`
 
           NOTE: graphQLEndpoint enables _Integrated GraphQL_. If not using integrated GraphQL, it can be removed.
+
+          NOTE: layoutServiceConfiguration should be set to "default" when using GraphQL Edge schema.
+          When using integrated GraphQL with Edge schema, a $language value is injected
+          since language is required in all Edge queries. "jss" configuration does not do this (which is backwards
+          compatible with JSS versions < 18.0.0).
         -->
         <app name="JssNextWeb"
+            layoutServiceConfiguration="default"
             sitecorePath="/sitecore/content/JssNextWeb"
             useLanguageSpecificLayout="true"
             graphQLEndpoint="/sitecore/api/graph/edge"