Some small doc updates

We change some formatting to sphinx-specific, to show how the
documentation can be improved.

Signed-off-by: Iustin Pop <iustin@google.com>
Reviewed-by: Guido Trotter <ultrotter@google.com>

doc/admin.rst

 Ganeti administrator's guide
 ============================
 
-Documents Ganeti version 2.0
+Documents Ganeti version |version|
 
 .. contents::
 
@@ -173,8 +173,8 @@ Importing an instance is similar to creating a new one. The command is::
   gnt-backup import -n TARGET_NODE -t DISK_TEMPLATE \
     --src-node=NODE --src-dir=DIR INSTANCE_NAME
 
-Most of the options available for the command *gnt-instance add* are
-supported here too.
+Most of the options available for the command :command:`gnt-instance
+add` are supported here too.
 
 High availability features
 --------------------------
@@ -262,6 +262,7 @@ you can deactivate them with the deactivate-disks command, which works
 in the same way.
 
 Accessing an instance's console
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 The command to access a running instance's console is::
 
@@ -281,8 +282,8 @@ command to ran to see a complete status for all your nodes is::
 Cluster-wide debugging
 ~~~~~~~~~~~~~~~~~~~~~~
 
-The *gnt-cluster* command offers several options to run tests or
-execute cluster-wide operations. For example::
+The :command:`gnt-cluster` command offers several options to run tests
+or execute cluster-wide operations. For example::
 
   gnt-cluster command
   gnt-cluster copyfile
@@ -291,4 +292,4 @@ execute cluster-wide operations. For example::
   gnt-cluster getmaster
   gnt-cluster version
 
-See the man page *gnt-cluster* to know more about their usage.
+See the man page :manpage:`gnt-cluster` to know more about their usage.

doc/design-2.0.rst

@@ -1558,8 +1558,8 @@ DEBUG_LEVEL
 
 These are only the basic variables we are thinking of now, but more
 may come during the implementation and they will be documented in the
-``ganeti-os-api`` man page. All these variables will be available to
-all scripts.
+:manpage:`ganeti-os-api` man page. All these variables will be
+available to all scripts.
 
 Some scripts will need a few more information to work. These will have
 per-script variables, such as for example:

doc/iallocator.rst

@@ -223,7 +223,7 @@ nodes
 
   No allocations should be made on nodes having either the ``drained``
   or ``offline`` flags set. More details about these of node status
-  flags is available in the manpage *ganeti(7)*.
+  flags is available in the manpage :manpage:`ganeti(7)`.
 
 
 Respone message

doc/install.rst

 Ganeti installation tutorial
 ============================
 
-Documents Ganeti version 2.0
+Documents Ganeti version |version|
 
 .. contents::
 
@@ -450,7 +450,7 @@ installed.
      apt-get install debootstrap dump kpartx
 
 Alternatively, you can create your own OS definitions. See the manpage
-*ganeti-os-interface*.
+:manpage:`ganeti-os-interface`.
 
 Initializing the cluster
 ++++++++++++++++++++++++