Make all the \seemodule explanations consistent: start with a capitalized
letter and end with proper punctuation.  "Documenting Python" will be
updated accordingly so that this will be editorial policy for the Python
documentation.
diff --git a/Doc/lib/libbase64.tex b/Doc/lib/libbase64.tex
index bede708..b608a8a 100644
--- a/Doc/lib/libbase64.tex
+++ b/Doc/lib/libbase64.tex
@@ -50,8 +50,8 @@
 
 
 \begin{seealso}
-  \seemodule{binascii}{support module containing \ASCII{}-to-binary
-                       and binary-to-\ASCII{} conversions}
+  \seemodule{binascii}{Support module containing \ASCII{}-to-binary
+                       and binary-to-\ASCII{} conversions.}
   \seetext{Internet \rfc{1521}, \emph{MIME (Multipurpose Internet
            Mail Extensions) Part One: Mechanisms for Specifying and
            Describing the Format of Internet Message Bodies}, section