[utility.intcmp] Rephrase integer type constraint of "standard or extended" as "signed or unsigned"

Author: eisenwave

source/utilities.tex

@@ -558,8 +558,8 @@
 \begin{itemdescr}
 \pnum
 \mandates
-Both \tcode{T} and \tcode{U} are standard integer types or
-extended integer types\iref{basic.fundamental}.
+Each of \tcode{T} and \tcode{U} is
+a signed or unsigned integer type\iref{basic.fundamental}.
 
 \pnum
 \effects
@@ -597,8 +597,8 @@
 \begin{itemdescr}
 \pnum
 \mandates
-Both \tcode{T} and \tcode{U} are standard integer types or
-extended integer types\iref{basic.fundamental}.
+Each of \tcode{T} and \tcode{U} is
+a signed or unsigned integer type\iref{basic.fundamental}.
 
 \pnum
 \effects
@@ -660,8 +660,8 @@
 \begin{itemdescr}
 \pnum
 \mandates
-Both \tcode{T} and \tcode{R} are standard integer types or
-extended integer types\iref{basic.fundamental}.
+Each of \tcode{T} and \tcode{U} is
+a signed or unsigned integer type\iref{basic.fundamental}.
 
 \pnum
 \effects