tape: add manual page for media-pool.cfg

docs/config/media-pool/format.rst

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+Each entry starts with a header ``pool: <name>``, followed by the
+media pool configuration options.
+
+::
+
+  pool: company1
+	allocation always
+	retention overwrite
+
+  pool: ...
+	
+
+You can use the ``proxmox-tape pool`` command to manipulate this file.

docs/config/media-pool/man5.rst

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+==========================
+media-pool.cfg
+==========================
+
+.. include:: ../../epilog.rst
+
+-------------------------------------------------------------
+Media Pool Configuration
+-------------------------------------------------------------
+
+:Author: |AUTHOR|
+:Version: Version |VERSION|
+:Manual section: 5
+
+Description
+===========
+
+The file /etc/proxmox-backup/media-pool.cfg is a configuration file
+for Proxmox Backup Server. It contains the medila pool configuration
+for tape backups.
+
+
+File Format
+===========
+
+.. include:: format.rst
+
+
+Options
+=======
+
+.. include:: config.rst
+
+
+.. include:: ../../pbs-copyright.rst