8274273: Update testing docs for MacOS with Non-US locale

Reviewed-by: erikj

doc/testing.html

@@ -229,7 +229,7 @@ TEST FAILURE</code></pre>
     JTREG=&quot;JAVA_OPTIONS=-Djdk.test.docker.image.name=ubuntu
     -Djdk.test.docker.image.version=latest&quot;</code></pre>
 <h3 id="non-us-locale">Non-US locale</h3>
-<p>If your locale is non-US, some tests are likely to fail. To work around this you can set the locale to US. On Unix platforms simply setting <code>LANG=&quot;en_US&quot;</code> in the environment before running tests should work. On Windows, setting <code>JTREG=&quot;VM_OPTIONS=-Duser.language=en -Duser.country=US&quot;</code> helps for most, but not all test cases.</p>
+<p>If your locale is non-US, some tests are likely to fail. To work around this you can set the locale to US. On Unix platforms simply setting <code>LANG=&quot;en_US&quot;</code> in the environment before running tests should work. On Windows or MacOS, setting <code>JTREG=&quot;VM_OPTIONS=-Duser.language=en -Duser.country=US&quot;</code> helps for most, but not all test cases.</p>
 <p>For example:</p>
 <pre><code>$ export LANG=&quot;en_US&quot; &amp;&amp; make test TEST=...
 $ make test JTREG=&quot;VM_OPTIONS=-Duser.language=en -Duser.country=US&quot; TEST=...</code></pre>

doc/testing.md

@@ -506,7 +506,7 @@ $ make test TEST="jtreg:test/hotspot/jtreg/containers/docker" \
 
 If your locale is non-US, some tests are likely to fail. To work around this
 you can set the locale to US. On Unix platforms simply setting `LANG="en_US"`
-in the environment before running tests should work. On Windows, setting
+in the environment before running tests should work. On Windows or MacOS, setting
 `JTREG="VM_OPTIONS=-Duser.language=en -Duser.country=US"` helps for most, but
 not all test cases.