fix duplicate words in qldoc

Author: erik-krogh

javascript/ql/lib/semmle/javascript/frameworks/Testing.qll

@@ -40,7 +40,7 @@ class BDDTest extends Test, @call_expr {
 
 /**
  * Gets the test file for `f` with stem extension `stemExt`, where `stemExt` is "test" or "spec".
- * That is, a file named file named `<base>.<stemExt>.<ext>` in the
+ * That is, a file named `<base>.<stemExt>.<ext>` in the
  * same directory as `f` which is named `<base>.<ext>`.
  */
 pragma[noinline]