Added entries for re, soundex modules.

Doc/lib/libstrings.tex

@@ -8,6 +8,9 @@ manipulation operations.  Here's an overview:
 \item[string]
 --- Common string operations.
 
+\item[re]
+--- New Perl-style regular expression search and match operations.
+
 \item[regex]
 --- Regular expression search and match operations.
 
@@ -20,4 +23,7 @@ manipulation operations.  Here's an overview:
 \item[StringIO]
 --- Read and write strings as if they were files.
 
+\item[soundex]
+--- Compute hash values for English words.
+
 \end{description}

Doc/libstrings.tex

@@ -8,6 +8,9 @@ manipulation operations.  Here's an overview:
 \item[string]
 --- Common string operations.
 
+\item[re]
+--- New Perl-style regular expression search and match operations.
+
 \item[regex]
 --- Regular expression search and match operations.
 
@@ -20,4 +23,7 @@ manipulation operations.  Here's an overview:
 \item[StringIO]
 --- Read and write strings as if they were files.
 
+\item[soundex]
+--- Compute hash values for English words.
+
 \end{description}