doc updates

doc/chapters/installation.rst

@@ -14,11 +14,10 @@ is build using QT designer and converted into a python UI window class by means
       - backend
       - createpointings
 
-
 The latter 4 classes are installed in the dtObsGUI directory and imported by
 python. Each class has an ini file and should be checked for each installation,
 see section: `Configuration`_. It sets e.g. the file locations of the measurement
-programmes, test modes, logging level etc. Make sure you can execute the
+programme, test modes, logging level etc. Make sure you can execute the
 programme as user.
 
 ::
@@ -31,7 +30,7 @@ programme as user.
     git clone https://gitlab.camras.nl/marc/createpointings.git
 
 On mecury the telescope class is already installed. For other systems the
-class can be installed locally or in system. 
+class can be installed locally or in system.
 
 ::
 
@@ -55,7 +54,7 @@ To ease the DEVOPS customization of dtObsGUI, each class has its own `.ini` file
 used by the config manager of python. The `.ini` files are key/value entries read
 during the instantiation of the class.
 
-The configuration of the `telescope` Class is described on `git-lab`_.
+The configuration of the `Telescope` Class is described on `git-lab`_.
 
 dtobsgui ini
 ------------
@@ -67,11 +66,12 @@ dtobsgui ini
 For normal operation the `INFO` level is sufficient and shows the entry and exit
 of executed methods.
 
-The demo can be set `True` to bypass the telescope class, which requires a
-connection to either the `consoledemo`_ or the DT telescope. This setting is for
-development purpose only. For proper operation of the software `demo` should be
-set to `False`
+The demo can be set `True` to bypass the Telescope class. Testing DTObs against
+a Telescope it is adviced to use the containerized dt_ctrl docker available on
+gitlab. The Telescope class double checks if it is hosted on Mercurius. In this
+case the Telescope class can control the DT.
 
+.. attention:: Please follow all savety steps prior controlling the DT!
 
 Example: