Fix obsolete claim about --run_under not accepting label argument for "run" command
It's been able to for about a decade, since unknown commit.
@@ -2271,8 +2271,7 @@ a user-friendly way.
This has the same effect as the <code class='flag'>--run_under</code> option for
<code>bazel test</code> (<a href='#flag--run_under'>see above</a>),
except that it applies to the command being run by <code>bazel
- run</code> rather than to the tests being run by <code>bazel test</code>
- and cannot run under label.
+ run</code> rather than to the tests being run by <code>bazel test</code>.
</p>
<h4>Filtering logging outputs from Bazel</h4>
