[css-text] Clarify some wording in line-break

Author: fantasai

css-text/Overview.html

@@ -1399,7 +1399,9 @@ <h3 id=line-break><span class=secno>5.2. </span> Breaking Rules for
       rel=biblioentry>[UNICODE]<!--{{!UNICODE}}--></a>.)
     </ul>
     If the <a href="#content-language"><i>content language</i></a> is
-    Chinese, Japanese, or Korean, then additionally:
+    Chinese, Japanese, or Korean, then additionally allow (but otherwise
+    forbid) for ‘<code class=css>normal</code>’ and ‘<code
+    class=css>loose</code>’:
     <ul>
      <li>breaks before hyphens:<br>
       ‐ U+2010, – U+2013, 〜 U+301C, ゠ U+30A0
@@ -1421,7 +1423,8 @@ <h3 id=line-break><span class=secno>5.2. </span> Breaking Rules for
       rel=biblioentry>[UNICODE]<!--{{!UNICODE}}--></a>.)
     </ul>
     If the <a href="#content-language"><i>content language</i></a> is
-    Chinese, Japanese, or Korean, then additionally:
+    Chinese, Japanese, or Korean, then additionally allow (but otherwise
+    forbid) for ‘<code class=css>loose</code>’:
     <ul>
      <li>breaks before certain centered punctuation marks:<br>
       : U+003A, ; U+003B, ・ U+30FB, ： U+FF1A, ； U+FF1B,

css-text/Overview.src.html

@@ -973,7 +973,8 @@ <h3 id="line-break">
             i.e. characters with the Unicode Line Break property <code>CJ</code>.
             (See <a href="http://www.unicode.org/Public/UNIDATA/LineBreak.txt">LineBreak.txt</a> in [[!UNICODE]].)
         </ul>
-        If the <i>content language</i> is Chinese, Japanese, or Korean, then additionally:
+        If the <i>content language</i> is Chinese, Japanese, or Korean,
+        then additionally allow (but otherwise forbid) for ''normal'' and ''loose'':
         <ul>
           <li>breaks before hyphens:<br>
             &#x2010;&nbsp;U+2010,  &#x2013;&nbsp;U+2013,  &#x301C;&nbsp;U+301C,
@@ -990,7 +991,8 @@ <h3 id="line-break">
             i.e. characters with the Unicode Line Break property <code>IN</code>.
             (See <a href="http://www.unicode.org/Public/UNIDATA/LineBreak.txt">LineBreak.txt</a> in [[!UNICODE]].)
         </ul>
-        If the <i>content language</i> is Chinese, Japanese, or Korean, then additionally:
+        If the <i>content language</i> is Chinese, Japanese, or Korean,
+        then additionally allow (but otherwise forbid) for ''loose'':
         <ul>
           <li>breaks before certain centered punctuation marks:<br>
             &#x003A;&nbsp;U+003A,  &#x003B;&nbsp;U+003B,  &#x30FB;&nbsp;U+30FB,