reword NEWS item

Author: MichaelChirico

NEWS.md

@@ -45,7 +45,7 @@
 * Set the default `complexity_limit` in `cyclocomp_linter` to 15. This is the same complexity limit that is enforced via
   `default_linters` (#693, #695, @AshesITR).
 * `lint_package()` now lints files in the `demo` directory by default (#703, @dmurdoch).
-* `commented_code_linter()` now no longer lints parts of actual code (#451, @AshesITR)
+* `commented_code_linter()` uses the parse tree to find comments, eliminating some false positives (#451, @AshesITR)
 
 # lintr 2.0.1