slurmrestd - Update comment for send_http_response_args_t->headers

Note that list_t entry type changed from http_header_entry_t to
http_header_t.

Issue: 50189
diff --git a/src/slurmrestd/http.h b/src/slurmrestd/http.h
index f721751..6f1f88c 100644
--- a/src/slurmrestd/http.h
+++ b/src/slurmrestd/http.h
@@ -100,7 +100,8 @@
 	uint16_t http_major; /* HTTP major version */
 	uint16_t http_minor; /* HTTP minor version */
 	http_status_code_t status_code; /* HTTP status code to send */
-	list_t *headers; /* list of http_header_entry_t to send (can be empty) */
+	/* list of http_header_entry_t to send (can be empty) */
+	list_t *headers; /* list_t of http_header_t* from client */
 	const char *body; /* body to send or NULL */
 	size_t body_length; /* bytes in body to send or 0 */
 	const char *body_encoding; /* body encoding type or NULL */