markup cleanups

Doc/lib/libcsv.tex

@@ -76,7 +76,7 @@ If literal newlines are important within a field, users need to read their
 file in a way that preserves the newlines. The behavior before 2.5 would
 introduce spurious characters into quoted fields, with no way for the user
 to control that behavior. The previous behavior caused considerable
-problems, particularly on platforms that did not use the Unix line ending
+problems, particularly on platforms that did not use the \UNIX{} line ending
 conventions, or with files that originated on those platforms --- users were
 finding mysterious newlines where they didn't expect them]{2.5}
 

Doc/lib/tkinter.tex

@@ -103,14 +103,14 @@ of an application. Each instance has its own associated Tcl interpreter.
 \end{classdesc}
 
 \begin{funcdesc}{Tcl}{screenName=None, baseName=None, className='Tk', useTk=0}
-The \function{Tcl} function is a factory function which creates an object
-much like that created by the \class{Tk} class, except that it does not
-initialize the Tk subsystem.  This is most often useful when driving the Tcl
-interpreter in an environment where one doesn't want to create extraneous
-toplevel windows, or where one cannot (i.e. Unix/Linux systems without an X
-server).  An object created by the \function{Tcl} object can have a Toplevel
-window created (and the Tk subsystem initialized) by calling its
-\method{loadtk} method.
+The \function{Tcl} function is a factory function which creates an
+object much like that created by the \class{Tk} class, except that it
+does not initialize the Tk subsystem.  This is most often useful when
+driving the Tcl interpreter in an environment where one doesn't want
+to create extraneous toplevel windows, or where one cannot (such as
+\UNIX/Linux systems without an X server).  An object created by the
+\function{Tcl} object can have a Toplevel window created (and the Tk
+subsystem initialized) by calling its \method{loadtk} method.
 \versionadded{2.4}
 \end{funcdesc}
 
@@ -316,10 +316,10 @@ is called \code{.} (period) and children are delimited by more
 periods.  For example, \code{.myApp.controlPanel.okButton} might be
 the name of a widget.
 
-\item[\var{options} ]
+\item[\var{options}]
 configure the widget's appearance and in some cases, its
 behavior.  The options come in the form of a list of flags and values.
-Flags are proceeded by a `-', like Unix shell command flags, and
+Flags are proceeded by a `-', like \UNIX{} shell command flags, and
 values are put in quotes if they are more than one word.
 \end{description}