Remove "bazel  detects illegal labels"
It goes without saying and doesn't help the reader to point it out.  Fixes
Closes
@@ -255,16 +255,6 @@ app_binary
//my/app/testdata:testdepot.zip # Right.
</pre>
-<p>
- If, by mistake, you refer to <code>testdepot.zip</code> by the wrong
- label, such as <code>//my/app:testdata/testdepot.zip</code>
- or <code>//my:app/testdata/testdepot.zip</code>, you will get an
- error from the build tool saying that the label "crosses a package
- boundary". You should correct the label by putting the colon after
- the directory containing the innermost enclosing BUILD file, i.e.,
- <code>//my/app/testdata:testdepot.zip</code>.
-</p>
-
<p>
Labels starting with <code>@//</code> are references to the main
repository, which will still work even from external repositories.
