Fix mongoose docs generation

PUBLISHED_FROM=331821dcd1f7dc8a94581cd8a9b51aa00a89fddc

docs/c-api/mg_http_server.h/mg_printf_http_chunk.md

@@ -0,0 +1,11 @@
+---
+title: "mg_printf_http_chunk()"
+decl_name: "mg_printf_http_chunk"
+symbol_kind: "func"
+signature: |
+  void mg_printf_http_chunk(struct mg_connection *nc, const char *fmt, ...);
+---
+
+Sends a printf-formatted HTTP chunk.
+Functionality is similar to `mg_send_http_chunk()`. 
+