docs(faq): clarify that browser logs are always level WARN and higher

Author: juliemr

Diff for: docs/faq.md

@@ -89,6 +89,8 @@ browser.manage().logs().get('browser').then(function(browserLog) {
 });
 ```
 
+This will output logs from the browser console. Note that logs below the set logging level will be ignored. WebDriver does not currently support changing the logging level for browser logs.
+
 How do I produce an XML report of my test results?
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