Benzimidazoles and Related Heterocycles. Part 10. A Novel Acid‐Catalyzed Rearrangement in the System 3‐(α‐Aminobenzyl)quinoxalin‐2(1H)‐one—Ethyl Acetoacetate as a Simple and Efficient Method for Synthesizing 2‐(Pyrrol‐3‐yl)benzimidazoles.