Update blockmax_maxscore_iterator.cppm (#1166)

### What problem does this PR solve?

seperate -> separate

### Type of change

- [x] Refactoring

src/storage/invertedindex/search/early_terminate_iterator/blockmax_maxscore_iterator.cppm

@@ -63,7 +63,7 @@ private:
     float common_block_max_bm25_score_ = 0.0f;
     Vector<float> common_block_max_bm25_score_parts_; // value at i: blockmax of sum of BM25 scores for iter i + 1, i + 2, ..., n - 1
     // pivot and must_have info
-    // seperate the iterators into two parts:
+    // separate the iterators into two parts:
     // 1. [0, pivot) : cannot add into part 2
     // 2. [pivot, n) : sum < threshold
     u32 pivot_ = sorted_iterators_.size();
@@ -90,4 +90,4 @@ private:
     Vector<Pair<u32, u64>> must_have_history_;
 };
 
-} // namespace infinity
+} // namespace infinity