Removed unnecessary section "Unicode literals"; all the discussion is
already present in the "String literals" section, including comments on
the "u" prefix and the additional escape sequences used for Unicode.

This relates to SF bug #442526.
diff --git a/Doc/ref/ref2.tex b/Doc/ref/ref2.tex
index e912242..02c05cd 100644
--- a/Doc/ref/ref2.tex
+++ b/Doc/ref/ref2.tex
@@ -355,7 +355,7 @@
 
 Unless an `r' or `R' prefix is present, escape sequences in strings
 are interpreted according to rules similar
-to those used by Standard \C{}.  The recognized escape sequences are:
+to those used by Standard C.  The recognized escape sequences are:
 \index{physical line}
 \index{escape sequence}
 \index{Standard C}
@@ -434,11 +434,6 @@
 (even mixing raw strings and triple quoted strings).
 
 
-\subsection{Unicode literals \label{unicode}}
-
-XXX explain more here...
-
-
 \subsection{Numeric literals\label{numbers}}
 
 There are four types of numeric literals: plain integers, long