Add hint how to sync 'proxyexclude' with NO_PROXY

Signed-off-by: Mohammed Abdellatif <[email protected]>

Author: mlatief

config/config.sample.php

@@ -534,7 +534,10 @@
 
 /**
  * List of host names that should not be proxied to.
- * For example ``['.mit.edu', 'foo.com']``.
+ * For example: ``['.mit.edu', 'foo.com']``.
+ *
+ * Hint: Use something like ``explode(',', getenv('NO_PROXY'))`` to sync this
+ * value with the global NO_PROXY option.
  *
  * Defaults to empty array.
  */