Remove a checkme in 3.1.6.2

per https://www.w3.org/2023/09/05-clreq-minutes.html#t05

Fix #531.

index.html

@@ -2001,8 +2001,8 @@ <h5>
           無論文本整體採用何種風格，當夾注符號與其他符號連續排列時，或者夾注符號重復出現（如開始+開始，結束+結束，或者結束+開始）時，都應該進行原則上的調整，以使文字體裁更加緊湊、易讀。
         </p>
 
-        <p its-locale-filter-list="en" lang="en" class="checkme">
-          The adjustment in principle should be: if any two adjacent punctuation marks take 2&nbsp;em, they should be reduced to 1.5&nbsp;em. Based on this principle, the typography style is allowed to be further adjusted so that the two punctuation marks take only 1&nbsp;em.
+        <p its-locale-filter-list="en" lang="en">
+          In principle, any two adjacent punctuation marks that are 2&nbsp;em wide should be reduced to 1.5&nbsp;em. Following the same principle, they may be reduced to 1&nbsp;em for certain typographic styles.
         </p>
         <p its-locale-filter-list="zh-hans" lang="zh-hans">
           原则上的调整度应为：如果任意两个相邻标点符号占用2个字宽，应当缩减成1.5个字宽。在此原则上，允许排版风格进一步调整让两个符号只占1个字宽。