internal/dl: add missing space after Archived versions title

Fixes golang/go#33084

Change-Id: I82b41f719ffeb8ec240175cc794ec404555e2e1c
Reviewed-on: https://go-review.googlesource.com/c/website/+/186017
Reviewed-by: Andrew Bonventre <andybons@golang.org>
diff --git a/internal/dl/tmpl.go b/internal/dl/tmpl.go
index cecc542..09cf7b4 100644
--- a/internal/dl/tmpl.go
+++ b/internal/dl/tmpl.go
@@ -166,10 +166,10 @@
 {{with .Archive}}
 <div class="toggle" id="archive">
   <div class="collapsed">
-    <h3 class="toggleButton" title="Click to show versions">Archived versions▹</h3>
+    <h3 class="toggleButton" title="Click to show versions">Archived versions ▹</h3>
   </div>
   <div class="expanded">
-    <h3 class="toggleButton" title="Click to hide versions">Archived versions▾</h3>
+    <h3 class="toggleButton" title="Click to hide versions">Archived versions ▾</h3>
     {{template "releases" .}}
   </div>
 </div>