Fix mongoose docs generation

PUBLISHED_FROM=331821dcd1f7dc8a94581cd8a9b51aa00a89fddc

docs/c-api/mg_http.h/intro.md

@@ -0,0 +1,26 @@
+---
+title: "Common API reference"
+symbol_kind: "intro"
+decl_name: "mg_http.h"
+items:
+  - { name: mg_connect_ws.md }
+  - { name: mg_connect_ws_opt.md }
+  - { name: mg_http_is_authorized.md }
+  - { name: mg_http_send_digest_auth_request.md }
+  - { name: mg_printf_websocket_frame.md }
+  - { name: mg_send_websocket_frame.md }
+  - { name: mg_send_websocket_framev.md }
+  - { name: mg_send_websocket_handshake.md }
+  - { name: mg_send_websocket_handshake2.md }
+  - { name: mg_send_websocket_handshake3.md }
+  - { name: mg_send_websocket_handshake3v.md }
+  - { name: mg_set_protocol_http_websocket.md }
+  - { name: mg_url_decode.md }
+  - { name: struct_http_message.md }
+  - { name: struct_mg_http_multipart_part.md }
+  - { name: struct_mg_ssi_call_ctx.md }
+  - { name: struct_websocket_message.md }
+---
+
+
+