- clean up some extra punctuation hidden in indexing markup

- fix a typo and one markup nit
- normalize whitespace

Doc/lib/libselect.tex

@@ -49,12 +49,12 @@ subsets of the first three arguments.  When the time-out is reached
 without a file descriptor becoming ready, three empty lists are
 returned.
 
-Amongst the acceptable object types in the lists are Python file
+Among the acceptable object types in the lists are Python file
 objects (e.g. \code{sys.stdin}, or objects returned by
 \function{open()} or \function{os.popen()}), socket objects
-returned by \function{socket.socket()},%
+returned by \function{socket.socket()}.%
 \withsubitem{(in module socket)}{\ttindex{socket()}}
-\withsubitem{(in module os)}{\ttindex{popen()}}.
+\withsubitem{(in module os)}{\ttindex{popen()}}
 You may also define a \dfn{wrapper} class yourself, as long as it has
 an appropriate \method{fileno()} method (that really returns a file
 descriptor, not just a random integer).
@@ -103,7 +103,6 @@ used will check for all 3 types of events.
 Registering a file descriptor that's already registered is not an
 error, and has the same effect as registering the descriptor exactly
 once.
- 
 \end{methoddesc}
 
 \begin{methoddesc}{unregister}{fd}
@@ -128,8 +127,6 @@ An empty list indicates that the call timed out and no file
 descriptors had any events to report.
 If \var{timeout} is given, it specifies the length of time in
 milliseconds which the system will wait for events before returning.
-If \var{timeout} is omitted, negative, or \code{None}, the call will
+If \var{timeout} is omitted, negative, or \constant{None}, the call will
 block until there is an event for this poll object.
 \end{methoddesc}
-
-