Normalized the word "Unix" to "\UNIX{}".

Changed "{\tt crypt}" to "\sectcode{crypt}" in section heading.

Doc/lib/libcrypt.tex

-\section{Built-in Module {\tt crypt}}
+\section{Built-in Module \sectcode{crypt}}
 \label{module-crypt}
 \bimodindex{crypt}
 
 This module implements an interface to the crypt({\bf 3}) routine,
 which is a one-way hash function based upon a modified DES algorithm;
-see the Unix man page for further details.  Possible uses include
+see the \UNIX{} man page for further details.  Possible uses include
 allowing Python scripts to accept typed passwords from the user, or
-attempting to crack Unix passwords with a dictionary.
+attempting to crack \UNIX{} passwords with a dictionary.
 \index{crypt(3)}
 
 \renewcommand{\indexsubitem}{(in module crypt)}

Doc/libcrypt.tex

-\section{Built-in Module {\tt crypt}}
+\section{Built-in Module \sectcode{crypt}}
 \label{module-crypt}
 \bimodindex{crypt}
 
 This module implements an interface to the crypt({\bf 3}) routine,
 which is a one-way hash function based upon a modified DES algorithm;
-see the Unix man page for further details.  Possible uses include
+see the \UNIX{} man page for further details.  Possible uses include
 allowing Python scripts to accept typed passwords from the user, or
-attempting to crack Unix passwords with a dictionary.
+attempting to crack \UNIX{} passwords with a dictionary.
 \index{crypt(3)}
 
 \renewcommand{\indexsubitem}{(in module crypt)}