s/rock-solid compiler/ownership model/

Closes #409.

It looks like #403
already addressed the first suggestion in that issue, so this commit
only touches on the second.

Author: oconnor663

templates/panels/language-values.hbs

@@ -18,9 +18,9 @@
       <section class="flex flex-column mw8 measure-wide-l pv3 pt4-ns ph3-l">
         <h3 class="f2 f1-l">Reliability</h3>
         <p class="f3 lh-copy">
-          Rust's rich type system and rock-solid compiler guarantee
-          memory-safety and thread-safety &mdash; and enable you to eliminate
-          many other classes of bugs at compile-time.
+          Rust's rich type system and ownership model guarantee memory-safety
+          and thread-safety &mdash; and enable you to eliminate many other
+          classes of bugs at compile-time.
         </p>
       </section>
       <section class="flex flex-column mw8 measure-wide-l pv3 pt4-ns pl4-l">