Issue #1485810 by nmudgal: Clarify wording for salt variable docs in default.settings.php

sites/default/default.settings.php

@@ -221,10 +221,10 @@
  * Salt for one-time login links and cancel links, form tokens, etc.
  *
  * This variable will be set to a random value by the installer. All one-time
- * login links will be invalidated if the value is changed.  Note that this
- * variable must have the same value on every web server.  If this variable is
- * empty, a hash of the serialized database credentials will be used as a
- * fallback salt.
+ * login links will be invalidated if the value is changed. Note that if your
+ * site is deployed on a cluster of web servers, you must ensure that this
+ * variable has the same value on each server. If this variable is empty, a hash
+ * of the serialized database credentials will be used as a fallback salt.
  *
  * For enhanced security, you may set this variable to a value using the
  * contents of a file outside your docroot that is never saved together