Adjust the index page intro text slightly

* Fix grammar
* Reword language goals to align with Go team's comms
* Mention "latest major release" assumption

Fixes #532

templates/index.tmpl

@@ -11,11 +11,10 @@
       <p>
         <a href="https://go.dev">Go</a> is an
         open source programming language designed for
-        building simple, fast, and reliable software.
-        Please read the official
-        <a href="https://go.dev/doc/tutorial/getting-started">documentation</a>
-        to learn a bit about Go code, tools packages,
-        and modules.
+        building scalable, secure and reliable software.
+        Please read the
+        <a href="https://go.dev/doc/tutorial/getting-started">official documentation</a>
+        to learn more.
       </p>
 
       <p>
@@ -25,6 +24,11 @@
         browse the full list below.
       </p>
 
+      <p>
+        Unless stated otherwise, examples here assume the
+        <a href="https://go.dev/doc/devel/release">latest major release Go</a>.
+      </p>
+
       <ul>
       {{range .}}
         <li><a href="{{.ID}}">{{.Name}}</a></li>