getpass: update docstrings (#49)

EasyDialogs was removed in 3.x. fallback_getpass will always be the answer here.
ff47a133e1eee9dab60b86fb0d56ccd1022f841a
diff --git a/Lib/getpass.py b/Lib/getpass.py
index be51121..36e17e4 100644
--- a/Lib/getpass.py
+++ b/Lib/getpass.py
@@ -7,7 +7,6 @@
                  echoing of the password contents while reading.
 
 On Windows, the msvcrt module will be used.
-On the Mac EasyDialogs.AskPassword is used, if available.
 
 """