Update messages/descriptions with how to fix the alert

Author: robertbrignull

.github/codeql/queries/progress-not-cancellable.ql

@@ -3,13 +3,15 @@
  * @kind problem
  * @problem.severity warning
  * @id vscode-codeql/progress-not-cancellable
- * @description If we call `withProgress` with `cancellable: false` then the
+ * @description If we call `withProgress` without `cancellable: true` then the
  * token that is given to us should be ignored because it won't ever be cancelled.
+ * This makes the code more confusing as it tries to account for cases that can't
+ * happen. The fix is to either not use the token or make the progress bar cancellable.
  */
 
 import javascript
 import ProgressBar
 
 from ProgressBar t
 where not t.isCancellable() and t.usesToken()
-select t, "The token should not be used when the progress bar is not cancelable"
+select t, "The token should not be used when the progress bar is not cancelable. Either stop using the token or mark the progress bar as cancellable."

.github/codeql/queries/token-not-used.ql

@@ -6,12 +6,13 @@
  * @description If we call `withProgress` with `cancellable: true` but then
  * ignore the token that is given to us, it will lead to a poor user experience
  * because the progress bar will appear to be canceled but it will not actually
- * affect the background process.
+ * affect the background process. Either check the token and respect when it
+ * has been cancelled, or mark the progress bar as not cancellable.
  */
 
 import javascript
 import ProgressBar
 
 from ProgressBar t
 where t.isCancellable() and not t.usesToken()
-select t, "This progress bar is $@ but the token is not used", t.getCancellableProperty(), "cancellable"
+select t, "This progress bar is $@ but the token is not used. Either use the token or mark the progress bar as not cancellable.", t.getCancellableProperty(), "cancellable"