minor comment fixes etc

faiss_vector_posting.go

@@ -336,7 +336,12 @@ func (sb *SegmentBase) InterpretVectorIndex(field string, except *roaring.Bitmap
 						return nil, err
 					}
 				} else if eligibleDocIDs.Stats().Cardinality > 0 {
-					// None of the documents are eligible per the filter query.
+					// Non-zero documents eligible per the filter query.
+
+					// Making doubly sure that the deleted docs do not make their
+					// way into the "inclusion" list, even though that's been
+					// accounted for when computing the eligible doc IDs.
+					eligibleDocIDs.AndNot(except)
 
 					// vector IDs corresponding to the local doc numbers to be
 					// considered for the search