clean up indexing for None, NotImplemented
closes SF bug #820344
diff --git a/Doc/api/concrete.tex b/Doc/api/concrete.tex
index 99bb0df..efcf299 100644
--- a/Doc/api/concrete.tex
+++ b/Doc/api/concrete.tex
@@ -85,7 +85,7 @@
\subsection{The None Object \label{noneObject}}
-\obindex{None@\texttt{None}}
+\obindex{None}
Note that the \ctype{PyTypeObject} for \code{None} is not directly
exposed in the Python/C API. Since \code{None} is a singleton,
testing for object identity (using \samp{==} in C) is sufficient.
diff --git a/Doc/ref/ref3.tex b/Doc/ref/ref3.tex
index 61d7796..1daf18a 100644
--- a/Doc/ref/ref3.tex
+++ b/Doc/ref/ref3.tex
@@ -134,8 +134,7 @@
It is used to signify the absence of a value in many situations, e.g.,
it is returned from functions that don't explicitly return anything.
Its truth value is false.
-\ttindex{None}
-\obindex{None@{\texttt{None}}}
+\obindex{None}
\item[NotImplemented]
This type has a single value. There is a single object with this value.
@@ -144,8 +143,7 @@
they do not implement the operation for the operands provided. (The
interpreter will then try the reflected operation, or some other
fallback, depending on the operator.) Its truth value is true.
-\ttindex{NotImplemented}
-\obindex{NotImplemented@{\texttt{NotImplemented}}}
+\obindex{NotImplemented}
\item[Ellipsis]
This type has a single value. There is a single object with this value.
diff --git a/Doc/ref/ref6.tex b/Doc/ref/ref6.tex
index e3b4427..a389176 100644
--- a/Doc/ref/ref6.tex
+++ b/Doc/ref/ref6.tex
@@ -48,7 +48,7 @@
section~\ref{print}) on a line by itself. (Expression statements
yielding \code{None} are not written, so that procedure calls do not
cause any output.)
-\ttindex{None}
+\obindex{None}
\indexii{string}{conversion}
\index{output}
\indexii{standard}{output}