Remove H75 (#3650)

Closes #3649 

H75 relates to 4.1.1 Parsing. As such, it can be removed.

Author: fstrr

techniques/failures/F77.html

@@ -31,7 +31,6 @@
       </section>
    </section><section id="related"><h2>Related Techniques</h2><ul>
       <li><a href="../general/G108">G108</a></li>
-      <li><a href="../html/H75">H75</a></li>
    </ul></section><section id="resources"><h2>Resources</h2>
 
          <ul>

techniques/html/H75.html

@@ -31,7 +31,6 @@
       </section>
    </section><section id="related"><h2>Related Techniques</h2><ul>
       <li><a href="../html/H74">H74</a></li>
-      <li><a href="../html/H75">H75</a></li>
    </ul></section><section id="resources"><h2>Resources</h2>
 
          <p>Refer to the resources section of <a href="https://www.w3.org/WAI/WCAG21/Techniques/general/G134">Validating Web

techniques/html/H88.html

@@ -158,14 +158,6 @@ <h3>Sufficient Techniques for Parsing</h3>
 
                   </li>
 
-                  <li>
-                     											             
-                     <a href="https://www.w3.org/WAI/WCAG21/Techniques/html/H75" class="html">Ensuring that 
-                        Web pages are well-formed
-                     </a>
-                     										           
-                  </li>
-                  
                </ul>
 
             </li>