Make the names of the referenced modules hyperlinks; they had not been

marked at all.

Doc/lib/libwhichdb.tex

@@ -6,14 +6,15 @@
 
 
 The single function in this module attempts to guess which of the
-several simple database modules available--dbm, gdbm, or
-dbhash--should be used to open a given file.
+several simple database modules available--\refmodule{dbm},
+\refmodule{gdbm}, or \refmodule{dbhash}--should be used to open a
+given file.
 
 \begin{funcdesc}{whichdb}{filename}
 Returns one of the following values: \code{None} if the file can't be
 opened because it's unreadable or doesn't exist; the empty string
-(\code{""}) if the file's format can't be guessed; or a string
-containing the required module name, such as \code{"dbm"} or
-\code{"gdbm"}.
+(\code{''}) if the file's format can't be guessed; or a string
+containing the required module name, such as \code{'dbm'} or
+\code{'gdbm'}.
 \end{funcdesc}