[x/go.dev] fix missing noopeners

Change-Id: Ife66a60f1da1c7fda47823a6e387c850c2eda126

X-GoDev-Commit: f47b79614f14f2cb2dacb2c64ee0386c9e985d20
diff --git a/go.dev/layouts/learn/section.html b/go.dev/layouts/learn/section.html
index 0f8d2be..39bbb49 100644
--- a/go.dev/layouts/learn/section.html
+++ b/go.dev/layouts/learn/section.html
@@ -8,7 +8,7 @@
         <p>
           Install the latest version of Go. For instructions to download and install
           the Go compilers, tools, and libraries,
-          <a href="https://golang.org/doc/install" target="_blank">
+          <a href="https://golang.org/doc/install" target="_blank" rel="noopener">
             view the install documentation.
           </a>
         </p>
diff --git a/go.dev/layouts/partials/security/card.html b/go.dev/layouts/partials/security/card.html
index d881ab2..bff5cf6 100644
--- a/go.dev/layouts/partials/security/card.html
+++ b/go.dev/layouts/partials/security/card.html
@@ -13,7 +13,7 @@
         <div class="Card-contentBody">{{.content | safeHTML}}</div>
         {{end}}
         <div class="Card-contentCta">
-          <a href="{{.url}}" target="_blank">
+          <a href="{{.url}}" target="_blank" rel="noopener">
           <span>{{.cta}}</span>
           <svg
             xmlns="http://www.w3.org/2000/svg"