scripts/bpf: Fix xdp_md forward declaration typo

Fix typo in struct xpd_md, generated from bpf_helpers_doc.py, which is
causing compilation warnings for programs using bpf_helpers.h

Fixes: 7a387bed47f7 ("scripts/bpf: teach bpf_helpers_doc.py to dump BPF helper definitions")
Signed-off-by: Andrii Nakryiko <[email protected]>
Signed-off-by: Alexei Starovoitov <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]
diff --git a/scripts/bpf_helpers_doc.py b/scripts/bpf_helpers_doc.py
index 15d3d83..7df9ce5 100755
--- a/scripts/bpf_helpers_doc.py
+++ b/scripts/bpf_helpers_doc.py
@@ -418,7 +418,7 @@
 
             'struct __sk_buff',
             'struct sk_msg_md',
-            'struct xpd_md',
+            'struct xdp_md',
     ]
     known_types = {
             '...',