DOCS-16710: regex options update (#85)

* DOCS-16710: regex options update

* fix

(cherry picked from commit c352c4e)

spec.html

@@ -162,10 +162,15 @@ <h3>Non-terminals</h3>
           <td class="fix nt"></td>
           <td class="fix op">|</td>
           <td class="fix ex">signed_byte(11) e_name cstring cstring</td>
-          <td>Regular expression - The first cstring is the regex pattern, the second is the regex options string.
-            Options are identified by characters, which must be stored in alphabetical order. Valid options are 'i' for
-            case insensitive matching, 'm' for multiline matching, 'x' for verbose mode, 'l' to make \w, \W, etc. locale
-            dependent, 's' for dotall mode ('.' matches everything), and 'u' to make \w, \W, etc. match unicode.</td>
+          <td>Regular expression - The first cstring is the regex
+            pattern, the second is the regex options string.
+            Options are identified by characters, which must be stored in
+            alphabetical order. Valid option characters are <code>i</code> for
+            case insensitive matching, <code>m</code> for multiline
+            matching, <code>s</code> for <i>dotall</i> mode ("." matches
+            everything), <code>x</code> for verbose mode, and
+            <code>u</code> to make "\w", "\W", etc. match Unicode.
+          </td>
         </tr>
         <tr>
           <td class="fix nt"></td>