Minor fixes to punctuation and grammar.
diff --git a/Doc/ref/ref3.tex b/Doc/ref/ref3.tex
index cef8d5c..129ab09 100644
--- a/Doc/ref/ref3.tex
+++ b/Doc/ref/ref3.tex
@@ -1324,15 +1324,15 @@
\begin{datadesc}{__slots__}
This class variable can be assigned a string, iterable, or sequence of strings
-with variable names used by instances. If defined in a new-style class
-definition, \var{__slots__} reserves space for the declared variables
+with variable names used by instances. If defined in a new-style class,
+\var{__slots__} reserves space for the declared variables
and prevents the automatic creation of \var{__dict__} and \var{__weakref__}
for each instance.
\versionadded{2.2}
\end{datadesc}
\noindent
-Notes on Using \var{__slots__}
+Notes on using \var{__slots__}
\begin{itemize}
@@ -1349,7 +1349,7 @@
defining \var{__slots__} do not support weak references to its instances.
If weak reference support is needed, then add \code{'__weakref__'} to the
sequence of strings in the \var{__slots__} declaration.
-\versionchanged[Previously, adding \code{__weakref__} to the \var{__slots__}
+\versionchanged[Previously, adding \code{'__weakref__'} to the \var{__slots__}
declaration would not enable support for weak references]{2.3}
\item \var{__slots__} are implemented at the class level by creating
@@ -1370,7 +1370,7 @@
\item \var{__slots__} do not work for classes derived from ``variable-length''
built-in types such as \class{long}, \class{str} and \class{tuple}.
-\item Any non-string iterable may be assigned \var{__slots__}.
+\item Any non-string iterable may be assigned to \var{__slots__}.
Mappings may also be used; however, in the future, special meaning may
be assigned to the values corresponding to each key.