Fix mongoose docs generation

PUBLISHED_FROM=331821dcd1f7dc8a94581cd8a9b51aa00a89fddc

docs/c-api/mg_net.h/mg_printf.md

@@ -0,0 +1,12 @@
+---
+title: "mg_printf()"
+decl_name: "mg_printf"
+symbol_kind: "func"
+signature: |
+  int mg_printf(struct mg_connection *, const char *fmt, ...);
+---
+
+Sends `printf`-style formatted data to the connection.
+
+See `mg_send` for more details on send semantics. 
+