Apply suggestion from @pablogsal

Author: pablogsal

Lib/profiling/sampling/heatmap_collector.py

@@ -1165,7 +1165,6 @@ def _build_navigation_buttons(self, filename: str, line_num: int) -> str:
         """
         line_key = (filename, line_num)
 
-        # Find which function this line belongs to
         funcname = self.line_to_function.get(line_key)
 
         # Get callers: look up by function definition line, not current line