fix(docs): change typoinitTRPC() to initTRPC (#3431)

Update router.md

Co-authored-by: Julius Marminge <julius0216@outlook.com>

www/docs/server/router.md

@@ -68,7 +68,7 @@ When initializing your router, tRPC allows you to:
 You can use method chaining to customize your `t`-object on initialization. For example:
 
 ```ts
-const t = initTRPC().context<Context>().meta<Meta>().create({
+const t = initTRPC.context<Context>().meta<Meta>().create({
   /* [...] */
 });
 ```