Merge pull request #2541 from micalevisk/patch-6

docs(faq): mention body parser on 'raw body' feature

Author: kamilmysliwiec

content/faq/raw-body.md

@@ -2,6 +2,8 @@
 
 One of the most common use-case for having access to the raw request body is performing webhook signature verifications. Usually to perform webhook signature validations the unserialized request body is required to calculate an HMAC hash.
 
+> warning **Warning** This feature can be used only if the built-in global body parser middleware is enabled, ie., you must not pass `bodyParser: false` when creating the app.
+
 #### Use with Express
 
 First enable the option when creating your Nest Express application: