Fix Blaze `--output_base` example to actually use different directories.
@@ -2848,7 +2848,7 @@ adb -s deadbeef install ...
<p>For example:</p>
<pre><code>
OUTPUT_BASE=/var/tmp/google/_bazel_johndoe/custom_output_base
- % bazel --output_base $OUTPUT_BASE build //foo &amp; bazel --output_base $OUTPUT_BASE build //bar
+ % bazel --output_base ${OUTPUT_BASE}1 build //foo &amp; bazel --output_base ${OUTPUT_BASE}2 build //bar
</code></pre>
<p>
In this command, the two Bazel commands run concurrently (because of
