Fix mongoose docs generation

PUBLISHED_FROM=331821dcd1f7dc8a94581cd8a9b51aa00a89fddc

docs/c-api/mg_dns.h/mg_parse_dns.md

@@ -0,0 +1,10 @@
+---
+title: "mg_parse_dns()"
+decl_name: "mg_parse_dns"
+symbol_kind: "func"
+signature: |
+  int mg_parse_dns(const char *buf, int len, struct mg_dns_message *msg);
+---
+
+Low-level: parses a DNS response. 
+