[format.string.std] Use "-" in unicode ranges as suggested in #3753

Author: Dawn Perchik

source/utilities.tex

@@ -19939,21 +19939,21 @@
 \begin{example}
 The estimated width of the following code points is 2:
 \begin{codeblock}
-U+1100 .. U+115F
+U+1100-U+115F
 U+2329
 U+232A
-U+2E80 .. U+303E
-U+3040 .. U+A4CF
-U+AC00 .. U+D7A3
-U+F900 .. U+FAFF
-U+FE10 .. U+FE19
-U+FE30 .. U+FE6F
-U+FF00 .. U+FF60
-U+FFE0 .. U+FFE6
-U+20000 .. U+2FFFD
-U+30000 .. U+3FFFD
-U+1F300 .. U+1F64F
-U+1F900 .. U+1F9FF
+U+2E80-U+303E
+U+3040-U+A4CF
+U+AC00-U+D7A3
+U+F900-U+FAFF
+U+FE10-U+FE19
+U+FE30-U+FE6F
+U+FF00-U+FF60
+U+FFE0-U+FFE6
+U+20000-U+2FFFD
+U+30000-U+3FFFD
+U+1F300-U+1F64F
+U+1F900-U+1F9FF
 \end{codeblock}
 The estimated width of other code points is 1.
 \end{example}