Remove (rejected) comment from DontReadFromInput

Ref: #4996 (comment)

Author: blueyed

src/_pytest/capture.py

@@ -693,13 +693,6 @@ def snap(self):
 
 
 class DontReadFromInput:
-    """Temporary stub class.  Ideally when stdin is accessed, the
-    capturing should be turned off, with possibly all data captured
-    so far sent to the screen.  This should be configurable, though,
-    because in automated test runs it is better to crash than
-    hang indefinitely.
-    """
-
     encoding = None
 
     def read(self, *args):