[DOC] add item about mouseover

mail_to/doc/index.rst

@@ -5,7 +5,8 @@
 Usage
 =====
 
-* Open Discuss menu
-* Many messages have Recipients info
-* For messages created before install module it will not work where the recipients is not set there is not way restore recipients value
-* Click Inbox left menu item, click Send mail button, set recipient and send message. This message will show recipient.
+* Open Discuss menu.
+* Many messages have Recipients info.
+* Click Inbox left menu item, click Send mail button, set recipient and send message. This message will show recipient.
+* To see the recipient's need hover the mouse over a message.
+* For messages created before install module it will not work where the recipients is not set there is not way restore recipients value.