Correct bug doc string (discovered by Berthold Hoellmann):
get_line_buffer() does not take an optional argument.
diff --git a/Modules/readline.c b/Modules/readline.c
index 594732b..79b8870 100644
--- a/Modules/readline.c
+++ b/Modules/readline.c
@@ -132,7 +132,7 @@
 }
 
 static char doc_get_line_buffer[] = "\
-get_line_buffer([function]) -> string\n\
+get_line_buffer() -> string\n\
 return the current contents of the line buffer.\
 ";