Fix comment format in http.h

Functions decl must follow comment to be correctly documented

PUBLISHED_FROM=6ab035cda470c2c23240db4435abd8c241c71b0d

docs/c-api/http.h/mg_connect_http_opt.md

@@ -0,0 +1,18 @@
+---
+title: "mg_connect_http_opt()"
+decl_name: "mg_connect_http_opt"
+symbol_kind: "func"
+signature: |
+  struct mg_connection *mg_connect_http_opt(struct mg_mgr *mgr,
+                                            mg_event_handler_t ev_handler,
+                                            struct mg_connect_opts opts,
+                                            const char *url,
+                                            const char *extra_headers,
+                                            const char *post_data);
+---
+
+Helper function that creates outbound HTTP connection.
+
+Mostly identical to mg_connect_http, but allows to provide extra parameters
+(for example, SSL parameters 
+