doc for _config backup argument (#38650)

lib/ansible/modules/network/eos/eos_config.py

@@ -113,8 +113,9 @@ options:
       - This argument will cause the module to create a full backup of
         the current C(running-config) from the remote device before any
         changes are made.  The backup file is written to the C(backup)
-        folder in the playbook root directory.  If the directory does not
+        folder in the playbook root directory or role root directory, if
-        exist, it is created.
+        playbook is part of an ansible role. If the directory does not exist,
+        it is created.
     type: bool
     default: 'no'
     version_added: "2.2"

lib/ansible/modules/network/ios/ios_config.py

@@ -117,8 +117,9 @@ options:
       - This argument will cause the module to create a full backup of
         the current C(running-config) from the remote device before any
         changes are made.  The backup file is written to the C(backup)
-        folder in the playbook root directory.  If the directory does not
+        folder in the playbook root directory or role root directory, if
-        exist, it is created.
+        playbook is part of an ansible role. If the directory does not exist,
+        it is created.
     type: bool
     default: 'no'
     version_added: "2.2"

lib/ansible/modules/network/iosxr/iosxr_config.py

@@ -113,8 +113,9 @@ options:
       - This argument will cause the module to create a full backup of
         the current C(running-config) from the remote device before any
         changes are made.  The backup file is written to the C(backup)
-        folder in the playbook root directory.  If the directory does not
+        folder in the playbook root directory or role root directory, if
-        exist, it is created.
+        playbook is part of an ansible role. If the directory does not exist,
+        it is created.
     type: bool
     default: 'no'
     version_added: "2.2"

lib/ansible/modules/network/junos/junos_config.py

@@ -92,8 +92,9 @@ options:
       - This argument will cause the module to create a full backup of
         the current C(running-config) from the remote device before any
         changes are made.  The backup file is written to the C(backup)
-        folder in the playbook root directory.  If the directory does not
+        folder in the playbook root directory or role root directory, if
-        exist, it is created.
+        playbook is part of an ansible role. If the directory does not exist,
+        it is created.
     type: bool
     default: 'no'
     version_added: "2.2"

lib/ansible/modules/network/nxos/nxos_config.py

@@ -119,8 +119,9 @@ options:
       - This argument will cause the module to create a full backup of
         the current C(running-config) from the remote device before any
         changes are made.  The backup file is written to the C(backup)
-        folder in the playbook root directory.  If the directory does not
+        folder in the playbook root directory or role root directory, if
-        exist, it is created.
+        playbook is part of an ansible role. If the directory does not exist,
+        it is created.
     type: bool
     default: 'no'
     version_added: "2.2"

lib/ansible/modules/network/vyos/vyos_config.py

@@ -63,7 +63,9 @@ options:
       - The C(backup) argument will backup the current devices active
         configuration to the Ansible control host prior to making any
         changes.  The backup file will be located in the backup folder
-        in the root of the playbook.
+        in the playbook root directory or role root directory, if
+        playbook is part of an ansible role. If the directory does not
+        exist, it is created.
     type: bool
     default: 'no'
   comment: