Add example of global fingerprint setting

Author: JoshuaMoelans

platform-includes/set-fingerprint/basic/native.mdx

@@ -1,3 +1,15 @@
+You can set a fingerprint to be added to all future events and errors:
+```c
+#include <sentry.h>
+
+sentry_set_fingerprint("myFingerPrint", NULL); // overwrites existing fingerprints
+my_fingerprinted_function(); // events are grouped on "myFingerPrint"
+
+sentry_clear_fingerprint(); // clears all fingerprints
+```
+
+For manually captured events, fingerprints can be added to the `fingerprint` key of the event. This will be prioritized over the globally set fingerprint:
+
 ```cpp
 #include <sentry.h>