Doc: fix example for iter() function. (GH-11959)

ciupicri · serhiy-storchaka · commit 11fa0e48a958 · 2019-02-21T09:53:06.000+02:00
read() returns bytes for a file opened in binary mode,
so b'' should be used as a sentinel instead of ''.
Otherwise the loop will be infinite.
diff --git a/Doc/library/functions.rst b/Doc/library/functions.rst
@@ -816,7 +816,7 @@ are always available.  They are listed here in alphabetical order.
 
       from functools import partial
       with open('mydata.db', 'rb') as f:
-          for block in iter(partial(f.read, 64), ''):
+          for block in iter(partial(f.read, 64), b''):
               process_block(block)
 
 
