Clarify that capwords() removes leading/trailing whitespace.
Remove references to regsub, which is obsolescent.
diff --git a/Doc/libstring.tex b/Doc/libstring.tex
index cc3f34f..1911801 100644
--- a/Doc/libstring.tex
+++ b/Doc/libstring.tex
@@ -96,9 +96,7 @@
Split the argument into words using \code{split}, capitalize each word
using \code{capitalize}, and join the capitalized words using
\code{join}. Note that this replaces runs of whitespace characters by
-a single space. (See also \code{regsub.capwords()} for a version
-that doesn't change the delimiters, and lets you specify a word
-separator.)
+a single space, and removes leading and trailing whitespace.
\end{funcdesc}
\begin{funcdesc}{expandtabs}{s\, tabsize}
@@ -161,8 +159,6 @@
it is nonzero, at most \var{maxsplit} number of splits occur, and the
remainder of the string is returned as the final element of the list
(thus, the list will have at most \code{\var{maxsplit}+1} elements).
-(See also \code{regsub.split()} for a version that allows specifying a
-regular expression as the separator.)
\end{funcdesc}
\begin{funcdesc}{splitfields}{s\optional{\, sep\optional{\, maxsplit}}}