Bug 1748344 - Correct link to web components polyfill add-on. r=me

src/releases/seamonkey2.53.10.1/index.en.html

@@ -602,7 +602,7 @@ Please read this before reporting any new bugs.
     We provide source code for 2.53.1 and future releases on
     <a href="https://gitlab.com/seamonkey-project">gitlab</a>. For accessing
     the site you currently need to use the
-    <a href="https://github.com/JustOff/github-wc-polyfill/accessible">web
+    <a href="https://github.com/JustOff/github-wc-polyfill/">web
     components polyfill add-on</a>.
     </dd>
   </dt>

src/releases/seamonkey2.53.10/index.en.html

@@ -731,7 +731,7 @@ Please read this before reporting any new bugs.
     We provide source code for 2.53.1 and future releases on
     <a href="https://gitlab.com/seamonkey-project">gitlab</a>. For accessing
     the site you currently need to use the
-    <a href="https://github.com/JustOff/github-wc-polyfill/accessible">web
+    <a href="https://github.com/JustOff/github-wc-polyfill/">web
     components polyfill add-on</a>.
     </dd>
   </dt>

src/releases/seamonkey2.53.9.1/index.en.html

@@ -563,7 +563,7 @@ Please read this before reporting any new bugs.
     We provide source code for 2.53.1 and future releases on
     <a href="https://gitlab.com/seamonkey-project">gitlab</a>. For accessing
     the site you currently need to use the
-    <a href="https://github.com/JustOff/github-wc-polyfill/accessible">web
+    <a href="https://github.com/JustOff/github-wc-polyfill/">web
     components polyfill add-on</a>.
     </dd>
   </dt>

src/releases/seamonkey2.53.9/index.en.html

@@ -607,7 +607,7 @@ Please read this before reporting any new bugs.
     We provide source code for 2.53.1 and future releases on
     <a href="https://gitlab.com/seamonkey-project">gitlab</a>. For accessing
     the site you currently need to use the
-    <a href="https://github.com/JustOff/github-wc-polyfill/accessible">web
+    <a href="https://github.com/JustOff/github-wc-polyfill/">web
     components polyfill add-on</a>.
     </dd>
   </dt>