[fix][BoyerMoore] fix a code bug, a little typo && refine text...maybe #2862
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本PR主要是为了修复一个算法代码上的bug,顺带改了几个之前就想改,但总感觉改不胜改的目前阶段所能发现的几处小笔误;
另外增加了一点点使内容更易于被理解的增改。