Remove unneeded "{}" that confused makeinfo.

Doc/lib/liboperator.tex

@@ -5,7 +5,7 @@
 
 The \code{operator} module exports a set of functions implemented in C
 corresponding to the intrinsic operators of Python.  For example,
-{}\code{operator.add(x, y)} is equivalent to the expression \code{x+y}.  The
+\code{operator.add(x, y)} is equivalent to the expression \code{x+y}.  The
 function names are those used for special class methods; variants without
 leading and trailing \samp{__} are also provided for convenience.
 

Doc/liboperator.tex

@@ -5,7 +5,7 @@
 
 The \code{operator} module exports a set of functions implemented in C
 corresponding to the intrinsic operators of Python.  For example,
-{}\code{operator.add(x, y)} is equivalent to the expression \code{x+y}.  The
+\code{operator.add(x, y)} is equivalent to the expression \code{x+y}.  The
 function names are those used for special class methods; variants without
 leading and trailing \samp{__} are also provided for convenience.