Update python/ql/lib/semmle/python/frameworks/Asyncpg.qll

Co-authored-by: Rasmus Wriedt Larsen <rasmuswriedtlarsen@gmail.com>

Author: yoff

python/ql/lib/semmle/python/frameworks/Asyncpg.qll

@@ -69,6 +69,9 @@ private module Asyncpg {
 
   /**
    * Holds if `result` is the result of awaiting `awaitedValue`.
+   *
+   * Internal helper predicate to achieve the same as `.awaited()` does for API graphs,
+   * but sutiable for use with type-tracking.
    */
   pragma[inline]
   DataFlow::Node awaited(DataFlow::Node awaitedValue) {