DOCS-125 Reword Return link to Percona <technology> documentation (#376)

Update header.html

_resource/overrides/partials/header.html

@@ -12,7 +12,7 @@
   <!-- Super Nav -->
   <div class="superNav">
     <div class="md-header__inner md-grid">
-      <a href="https://docs.percona.com/percona-for-mysql/" title="Percona Documentation home page">
+      <a href="https://docs.percona.com/percona-for-mysql/" title="Percona Software for MySQL Documentation">
         <svg width="24" height="24" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">
           <mask id="a" style="mask-type:alpha" maskUnits="userSpaceOnUse" x="0" y="0" width="24" height="24">
             <path d="M0 0h24v24H0z"/>
@@ -21,7 +21,7 @@
             <path d="m7.825 13 5.6 5.6L12 20l-8-8 8-8 1.425 1.4-5.6 5.6H20v2H7.825Z"/>
           </g>
         </svg>
-        <span>Percona Documentation</span>
+        <span>Percona Software for MySQL Documentation</span>
       </a>
     </div>
   </div>