Editorial: Use <code> for values from other specifications

Ref tc39/ecma262#2594

spec/locale-sensitive-functions.html

@@ -97,7 +97,7 @@ <h1>
         </emu-alg>
 
         <p>
-          Code point mappings may be derived according to a tailored version of the Default Case Conversion Algorithms of the Unicode Standard. Implementations may use locale-sensitive tailoring defined in SpecialCasings.txt and/or CLDR and/or any other custom tailoring. Regardless of tailoring, a conforming implementation's case transformation algorithm must always yield the same result given the same input code points, locale, and target case.
+          Code point mappings may be derived according to a tailored version of the Default Case Conversion Algorithms of the Unicode Standard. Implementations may use locale-sensitive tailoring defined in the file <a href="https://unicode.org/Public/UCD/latest/ucd/SpecialCasing.txt"><code>SpecialCasing.txt</code></a> of the Unicode Character Database and/or CLDR and/or any other custom tailoring. Regardless of tailoring, a conforming implementation's case transformation algorithm must always yield the same result given the same input code points, locale, and target case.
         </p>
 
         <emu-note>