Meta: Upgrade ecmarkup

package.json

@@ -21,7 +21,7 @@
   "license": "SEE LICENSE IN https://tc39.es/ecma402/#sec-copyright-and-software-license",
   "homepage": "https://tc39.es/ecma402/",
   "dependencies": {
-    "ecmarkup": "^7.0.2"
+    "ecmarkup": "^8.0.0"
   },
   "devDependencies": {
     "@alrra/travis-scripts": "^3.0.1"

spec/datetimeformat.html

@@ -374,7 +374,7 @@ <h1>FormatDateTimePattern ( _dateTimeFormat_, _patternParts_, _x_, _rangeFormatO
           1. Else if _p_ is equal to *"timeZoneName"*, then
             1. Let _f_ be _dateTimeFormat_.[[TimeZoneName]].
             1. Let _v_ be _dateTimeFormat_.[[TimeZone]].
-            1. Let _fv_ be a String value representing _v_ in the form given by _f_; the String value depends upon the implementation and the effective locale. The String value may also depend on the value of the [[InDST]] field of _tm_.  If the implementation does not have a localized representation of _f_, then use the String value of _v_ itself.
+            1. Let _fv_ be a String value representing _v_ in the form given by _f_; the String value depends upon the implementation and the effective locale. The String value may also depend on the value of the [[InDST]] field of _tm_. If the implementation does not have a localized representation of _f_, then use the String value of _v_ itself.
             1. Append a new Record { [[Type]]: _p_, [[Value]]: _fv_ } as the last element of the list _result_.
           1. Else if _p_ matches a Property column of the row in <emu-xref href="#table-datetimeformat-components"></emu-xref>, then
             1. If _rangeFormatOptions_ is not *undefined*, let _f_ be the value of _rangeFormatOptions_'s field whose name matches _p_.