Update RUSTSEC-0000-0000.md

Surround the TOML data with code markers.

Author: mmastrac

Diff for: crates/openssl-probe/RUSTSEC-0000-0000.md

@@ -1,3 +1,4 @@
+```
 [advisory]
 id = "RUSTSEC-0000-0000"
 package = "openssl-probe"
@@ -14,3 +15,4 @@ os = ["linux"]
 
 [versions]
 patched = []
+```