Fixed a handful of typos (GH-343)

diff --git a/Doc/library/idle.rst b/Doc/library/idle.rst
index a629bc5..07c2a25 100644
--- a/Doc/library/idle.rst
+++ b/Doc/library/idle.rst
@@ -446,7 +446,7 @@
 Calltips
 ^^^^^^^^
 
-A calltip is shown when one types :kbd:`(` after the name of an *acccessible*
+A calltip is shown when one types :kbd:`(` after the name of an *accessible*
 function.  A name expression may include dots and subscripts.  A calltip
 remains until it is clicked, the cursor is moved out of the argument area,
 or :kbd:`)` is typed.  When the cursor is in the argument part of a definition,