[css-text-3] Fix markup error

Author: frivoal

css-text-3/Overview.bs

@@ -2388,12 +2388,12 @@ Text Processing</h3>
 
   <div class="note">
     <p>
-      Note: [UAX14] defines a baseline behavior
+      Note: [[UAX14]] defines a baseline behavior
       for line breaking for all scripts in Unicode,
       which is expected to be further tailored.
       Further information on line breaking conventions
-      can be found in [JLREQ] and [JIS4051] for Japanese,
-      [CLREQ] and [ZHMARK] for Chinese.
+      can be found in [[JLREQ]] and [[JIS4051]] for Japanese,
+      [[CLREQ]] and [[ZHMARK]] for Chinese.
       See also the
       <a href="https://www.w3.org/International/">Internationalization Working Group</a>’s
       <a href="https://www.w3.org/TR/typography/#blocks_paragraphs">Typography Index</a> [[TYPOGRAPHY]]