message: Update description in empty_needle_removal.hpp
  fix the original notes.
diff: namespace duckdb {
  -// The Like Optimization rule rewrites LIKE to optimized scalar functions (e.g.: prefix, suffix, and contains)
  +// The Empty_needle_removal Optimization rule folds some foldable ConstantExpression
  +//(e.g.: PREFIX('xyz', '') is TRUE, PREFIX(NULL, '') is NULL, so rewrite PREFIX(x, '') to (CASE WHEN x IS NOT NULL THEN)
  class EmptyNeedleRemovalRule : public Rule {
  public:
  EmptyNeedleRemovalRule(ExpressionRewriter &rewriter);
  