unicode: remove an extra space

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/7856044

src/pkg/unicode/maketables.go

@@ -440,7 +440,7 @@ func printCategories() {
 			varDecl = "\tLetter = _L;	// Letter/L is the set of Unicode letters, category L.\n"
 			varDecl += "\tL = _L\n"
 		case "M":
-			varDecl = "\tMark = _M;	// Mark/M is the set of Unicode mark characters, category  M.\n"
+			varDecl = "\tMark = _M;	// Mark/M is the set of Unicode mark characters, category M.\n"
 			varDecl += "\tM = _M\n"
 		case "N":
 			varDecl = "\tNumber = _N;	// Number/N is the set of Unicode number characters, category N.\n"

src/pkg/unicode/tables.go

@@ -2864,7 +2864,7 @@ var (
 	Lo     = _Lo // Lo is the set of Unicode characters in category Lo.
 	Lower  = _Ll // Lower is the set of Unicode lower case letters.
 	Ll     = _Ll // Ll is the set of Unicode characters in category Ll.
-	Mark   = _M  // Mark/M is the set of Unicode mark characters, category  M.
+	Mark   = _M  // Mark/M is the set of Unicode mark characters, category M.
 	M      = _M
 	Mc     = _Mc // Mc is the set of Unicode characters in category Mc.
 	Me     = _Me // Me is the set of Unicode characters in category Me.