message: Fixed documentation bug found by Ramana who sent a patch to the lldb-dev list.
diff: built with a custom version of clang, do:
  </p>
  <code>
  - <br />&gt; cmake -DLLDB_TEST_ARGS="-A i386 -C /path/to/custom/clang" -G Ninja
  + <br />&gt; cmake -DLLDB_TEST_USER_ARGS="-A i386 -C /path/to/custom/clang" -G Ninja
  <br />&gt; ninja check-lldb
  </code>
  <p>Note that multiple -A and -C flags can be specified to <tt>LLDB_TEST_USER_ARGS</tt>.</p>
  