doc update from HEAD. don't list "Unix, Windows" as a platform since that

covers everything now that Mac OS 9 isn't a popular issue.

Doc/lib/libbsddb.tex

@@ -2,7 +2,6 @@
          Interface to Berkeley DB library}
 
 \declaremodule{extension}{bsddb}
-  \platform{Unix, Windows}
 \modulesynopsis{Interface to Berkeley DB database library}
 \sectionauthor{Skip Montanaro}{skip@mojam.com}
 

Doc/lib/libdbhash.tex

@@ -2,7 +2,6 @@
          DBM-style interface to the BSD database library}
 
 \declaremodule{standard}{dbhash}
-  \platform{Unix, Windows}
 \modulesynopsis{DBM-style interface to the BSD database library.}
 \sectionauthor{Fred L. Drake, Jr.}{fdrake@acm.org}
 

Doc/lib/libpopen2.tex

@@ -2,7 +2,6 @@
          Subprocesses with accessible I/O streams}
 
 \declaremodule{standard}{popen2}
-  \platform{Unix, Windows}
 \modulesynopsis{Subprocesses with accessible standard I/O streams.}
 \sectionauthor{Drew Csillag}{drew_csillag@geocities.com}