[docs] Add steps for incoming-mails for packaged installation

[ci skip]

docs/configuration/incoming-emails.md

@@ -9,7 +9,14 @@ Receiving emails is done via a rake task that fetches emails from an email serve
 ### IMAP
 
 The rake task `redmine:email:receive_imap` fetches emails via IMAP and parses them.
-Example:
+
+**Packaged installation**
+
+```bash
+openproject run bundle exec rake redmine:email:receive_imap host='imap.gmail.com' username='test_user' password='password' port=993 ssl=true allow_override=type,project project=test_project
+```
+
+**Manual installation**
 
 ```bash
 bundle exec rake redmine:email:receive_imap host='imap.gmail.com' username='test_user' password='password' port=993 ssl=true allow_override=type,project project=test_project
@@ -42,7 +49,14 @@ Available arguments that change how the work packages are handled:
 ### POP3
 
 The rake task `redmine:email:receive_pop3` fetches emails via IMAP and parses them.
-Example:
+**Packaged installation**
+
+```bash
+openproject run bundle exec rake redmine:email:receive_imap host='imap.gmail.com' username='test_user' password='password' port=993 ssl=true allow_override=type,project project=test_project
+```
+
+**Manual installation**
+
 ```bash
 bundle exec rake redmine:email:receive_pop3 host='pop.gmail.com' username='test_user' password='password' port=995 allow_override=priority
 ```