Fix typo in `user-manual.html`
And adjust macOS name
Closes
@@ -858,7 +858,7 @@ $ bazel fetch //...
Bazel uses sandboxes to guarantee that actions run hermetically<sup>1</sup> and correctly.
Bazel runs <i>Spawn</i>s (loosely speaking: actions) in sandboxes that only contain the minimal
set of files the tool requires to do its job. Currently sandboxing works on Linux 3.12 or newer
- with the <code>CONFIG_USER_NS</code> option enabled, and also on Mac OS 10.11 for newer.
+ with the <code>CONFIG_USER_NS</code> option enabled, and also on macOS 10.11 or newer.
</p>
<p>
Bazel will print a warning if your system does not support sandboxing to alert you to the fact
