update before_send docs

Author: JoshuaMoelans

docs/platforms/native/common/configuration/filtering.mdx

@@ -24,7 +24,7 @@ Note also that breadcrumbs can be filtered, as discussed in [our Breadcrumbs doc
 
 #### Event Hints
 
-The <PlatformIdentifier name="before-send" /> callback is passed both the `event` and a second argument, `hint`, that holds one or more hints.
+The <PlatformIdentifier name="before-send" /> callback is passed the `event`, a second argument `hint` and lastly custom `user_data`.
 
 Typically, a `hint` holds the original exception so that additional data can be extracted or grouping is affected. In this example, the fingerprint is forced to a common value if an exception of a certain type has been caught:
 

platform-includes/configuration/before-send-hint/native.mdx

@@ -1,14 +1,14 @@
 <Alert>
 
-The Native SDK does not pass exception information into the hint, but instead allows to set a custom hint in SDK options. To detect the exception type, inspect the event instead.
+The Native SDK does not pass exception information into the hint, but instead allows to set custom user data in the `before_send` SDK option. To detect the exception type, inspect the event instead.
 
 </Alert>
 
 ```c
 #include <string.h>
 #include <sentry.h>
 
-sentry_value_t before_send(sentry_value_t event, void *hint) {
+sentry_value_t before_send(sentry_value_t event, void *hint, void *user_data) {
   /* sentry_value_t functions handle NULL automatically */
   sentry_value_t exceptions = sentry_value_get_by_key(event, "exception");
   sentry_value_t values = sentry_value_get_by_key(exceptions, "values");
@@ -17,7 +17,7 @@ sentry_value_t before_send(sentry_value_t event, void *hint) {
   const char *type_str = sentry_value_as_string(type);
 
   /* use the data passed during initialization */
-  const char *custom_error = (const char *)hint;
+  const char *custom_error = (const char *)user_data;
 
   if (type_str && strcmp(type_str, custom_error) == 0) {
     sentry_value_t fingerprint = sentry_value_new_list();