doc:updated env config example

Author: Amitkanswal

.env.local.sample

@@ -12,8 +12,12 @@ CONTENTSTACK_API_HOST=
 CONTENTSTACK_APP_HOST=
 CONTENTSTACK_LIVE_PREVIEW=true
 
+#site-map
+NEXT_PUBLIC_HOSTED_URL=http://localhost:3000
+# Requires host url for sitemap. Localhost:3000 is set as default value
+
 # For enabling live editing tags for this project set NEXT_PUBLIC_CONTENTSTACK_LIVE_PREVIEW=true by default it is set to false
 # For NA region add CONTENTSTACK_APP_HOST=app.contentstack.com
 # For EU region add CONTENTSTACK_APP_HOST=eu-app.contentstack.com
 # For setting region add  CONTENTSTACK_REGION=(Optional for US region) Eg- eu
-# For setting custom host add CONTENTSTACK_API_HOST=for(NA: api.contentstack.io, EU: eu-api.contentstack.com)
+# For setting custom host add CONTENTSTACK_API_HOST=for(NA: api.contentstack.io, EU: eu-api.contentstack.com)