How to load multiple python plugins

This adds a configuration example on how to load multiple python plugins
via 'Dir Plugin Options' Directive.

docs/manuals/en/main/plugins.tex

@@ -480,9 +480,9 @@ \subsubsection{Loading plugins}
 \end{itemize}
 
 
-Example:
+Single Python Plugin Loading Example:
 
-\begin{bconfig}{bareos-dir.conf: Python Plugins}
+\begin{bconfig}{bareos-dir.conf: Single Python Plugin Loading Example}
 Director {
   # ...
   # Plugin directory
@@ -501,6 +501,30 @@ \subsubsection{Loading plugins}
 }
 \end{bconfig}
 
+
+Multiple Python Plugin Loading Example:
+
+\begin{bconfig}{bareos-dir.conf: Multiple Python Plugin Loading Example}
+Director {
+  # ...
+  # Plugin directory
+  Plugin Directory = /usr/lib64/bareos/plugins
+  # Load the python plugin
+  Plugin Names = "python"
+}
+
+JobDefs {
+  Name = "DefaultJob"
+  Type = Backup
+  # ...
+  # Load the class based plugin with testoption=testparam
+  Dir Plugin Options = "python:instance=0:module_path=/usr/lib64/bareos/plugins:module_name=bareos-dir-class-plugins:testoption=testparam1
+  Dir Plugin Options = "python:instance=1:module_path=/usr/lib64/bareos/plugins:module_name=bareos-dir-class-plugins:testoption=testparam2
+  # ...
+}
+\end{bconfig}
+
+
 \subsubsection{Write your own Python Plugin}
 
 Some plugin examples are available on \url{https://github.com/bareos/bareos-contrib}.