docs: added explanation section

Author: kouts

docs/content/1.getting-started/2.configuration.md

@@ -186,7 +186,9 @@ export default defineNuxtConfig({
 
 ## Using with tRPC Nuxt
 
-In order to make the [CSRF](/security/csrf) functionality of this module work with [trpc-nuxt](https://github.com/wobsoriano/trpc-nuxt), we have to add the CSRF token value into a `csrf-token` header inside the outgoing request headers in our `trpc` client.
+TRPC [uses `POST` requests](https://trpc.io/docs/rpc#methods---type-mapping) for the mutation endpoints. Using the CSRF protection functionality of this module with [trpc-nuxt](https://github.com/wobsoriano/trpc-nuxt) will help you protect your mutation endpoints from CSRF.
+
+In order to make the [CSRF](/security/csrf) functionality of this module work with `trpc-nuxt`, we have to add the CSRF token value into a `csrf-token` header inside the outgoing request headers in our `trpc` client.
 
 ```ts
 import { createTRPCNuxtClient, httpBatchLink } from "trpc-nuxt/client";