fix: drop useless comments

Signed-off-by: yihong0618 <[email protected]>

Author: yihong0618

Lib/_pyrepl/reader.py

@@ -297,7 +297,6 @@ def calc_screen(self) -> list[str]:
         if self.last_refresh_cache.valid(self):
             offset, num_common_lines = self.last_refresh_cache.get_cached_location(self)
 
-        # Use slicing instead of del to avoid modifying the cached lists.
         screen = self.last_refresh_cache.screen[:num_common_lines]
         screeninfo = self.last_refresh_cache.screeninfo[:num_common_lines]