Editorial: Reference the correct 'align-self' and fix a typo

These were introduced in #4143.

source

@@ -3633,13 +3633,14 @@ a.setAttribute('href', 'https://example.com/'); // change the content attribute
     <ul class="brief">
      <li>The <dfn data-x-href="https://drafts.csswg.org/css-align/#propdef-align-content">'align-content'</dfn> property</li>
      <li>The <dfn data-x-href="https://drafts.csswg.org/css-align/#propdef-align-items">'align-items'</dfn> property</li>
+     <li>The <dfn data-x-href="https://drafts.csswg.org/css-align/#propdef-align-self">'align-self'</dfn> property</li>
      <li>The <dfn data-x-href="https://drafts.csswg.org/css-align/#propdef-justify-self">'justify-self'</dfn> property</li>
      <li>The <dfn data-x-href="https://drafts.csswg.org/css-align/#propdef-propdef-justify-content">'justify-content'</dfn> property</li>
      <li>The <dfn data-x-href="https://drafts.csswg.org/css-align/#propdef-propdef-justify-items">'justify-items'</dfn> property</li>
     </ul>
 
-    <p>The following terms and features are defined in theis defined in
-    the <cite>CSS Display</cite> specification. <ref spec=CSSDISPLAY></p>
+    <p>The following terms and features are defined in the <cite>CSS Display</cite> specification.
+    <ref spec=CSSDISPLAY></p>
 
     <ul class="brief">
      <li><dfn data-x-href="https://drafts.csswg.org/css-display/#outer-display-type">outer display type</dfn></li>
@@ -3656,7 +3657,6 @@ a.setAttribute('href', 'https://example.com/'); // change the content attribute
     specification: <ref spec=CSSFLEXBOX></p>
 
     <ul class="brief">
-      <li>The <dfn data-x-href="https://drafts.csswg.org/css-flexbox/#propdef-align-self">'align-self'</dfn> property</li>
       <li>The <dfn data-x-href="https://drafts.csswg.org/css-flexbox/#propdef-flex-direction">'flex-direction'</dfn> property</li>
       <li>The <dfn data-x-href="https://drafts.csswg.org/css-flexbox/#propdef-flex-wrap">'flex-wrap'</dfn> property</li>
     </ul>