improve code comment

Co-authored-by: Anderson Arboleya <anderson@arboleya.me>

packages/account/src/predicate/predicate.ts

@@ -288,7 +288,7 @@ export class Predicate<TInputData extends InputValue[]> extends Account {
 
       if (!allInputsAreEmpty) {
         /**
-         * If at least one resource was added as predicate resource, we need to check if it was the
+         * If at least one resource was added as a predicate resource, we need to check if it was the
          * first one. If that is the case, we don't need to remove the witness placeholder
          * as this was added with the "witnessIndex" as 0 and without a placeholder witness. Later if
          * any resource without predicate is added, it will have the same witnessIndex because it has the