A doc update and a small indentation fix

This adds a small paragraph about the “master” role of a node, and fixes
a wrong indentation in the bash completion file.

Reviewed-by: imsnah

doc/examples/bash_completion.in

@@ -106,10 +106,10 @@ _gnt_cluster()
       # complete arguments to the command
       case "$prev" in
         "queue")
-        COMPREPLY=( $(compgen -W "drain undrain info" -- ${cur}) )
-        ;;
-      *)
-        ;;
+          COMPREPLY=( $(compgen -W "drain undrain info" -- ${cur}) )
+          ;;
+	*)
+          ;;
       esac
   esac
 

man/ganeti.sgml

@@ -92,6 +92,19 @@
 
       <para>Each node can be in one of the following states:
         <variablelist>
+          <varlistentry>
+            <term>master</term>
+            <listitem>
+              <para>
+                Only one node per cluster can be in this role, and
+                this node is the one holding the authoritative copy of
+                the cluster configuration and the one that can
+                actually execute commands on the cluster and modify
+                the cluster state. See more details under
+                <emphasis>Cluster configuration</emphasis>.
+              </para>
+            </listitem>
+          </varlistentry>
           <varlistentry>
             <term>master_candidate</term>
             <listitem>