Update x-window-system.md

docs.it4i/general/accessing-the-clusters/graphical-user-interface/x-window-system.md

@@ -17,7 +17,7 @@ In order to display the GUI of various software tools, you need to enable the X
 
 ### PuTTY on Windows
 
-On Windows, use the PuTTY client to enable X11 forwarding. In PuTTY menu, go to Connection-SSH-X11, mark the Enable X11 forwarding checkbox before logging in.
+On Windows, use the PuTTY client to enable X11 forwarding. In PuTTY menu, go to _Connection > SSH > X11_ and check the _Enable X11 forwarding_ checkbox before logging in.
 
 ![](../../../img/cygwinX11forwarding.png)
 
@@ -25,7 +25,7 @@ Then log in as usual.
 
 ### WSL (Bash on Windows)
 
-In order to display the GUI of various software tools, you need to enable the X display forwarding. Log in using the -X option in the SSH client:
+In order to display the GUI of various software tools, you need to enable the X display forwarding. Log in using the `-X` option in the SSH client:
 
 ```console
  local $ ssh -X username@cluster-name.it4i.cz
@@ -77,7 +77,7 @@ Read more [here][h].
 !!! note
     Make sure that X forwarding is activated and the X server is running.
 
-Then launch the application as usual. Use the & to run the application in background:
+Then launch the application as usual. Use the `&` to run the application in background:
 
 ```console
 $ ml intel (idb and gvim not installed yet)
@@ -92,15 +92,15 @@ In this example, we activate the Intel programing environment tools and then sta
 
 ## GUI Applications on Compute Nodes
 
-Allocate the compute nodes using -X option on the qsub command:
+Allocate the compute nodes using the `-X` option on the `qsub` command:
 
 ```console
 $ qsub -q qexp -l select=2:ncpus=24 -X -I
 ```
 
-In this example, we allocate 2 nodes via qexp queue, interactively. We request X11 forwarding with the -X option. It will be possible to run the GUI enabled applications directly on the first compute node.
+In this example, we allocate 2 nodes via qexp queue, interactively. We request X11 forwarding with the `-X` option. It will be possible to run the GUI enabled applications directly on the first compute node.
 
-For **better performance**, log on the allocated compute node via SSH, using the -X option.
+For **better performance**, log on the allocated compute node via SSH, using the `-X` option.
 
 ```console
 $ ssh -X r24u35n680
@@ -121,7 +121,7 @@ xserver-xephyr, on OS X it is part of [XQuartz][i]. First, launch Xephyr on loca
 local $ Xephyr -ac -screen 1024x768 -br -reset -terminate :1 &
 ```
 
-This will open a new X window of size 1024x768 at DISPLAY :1. Next, connect via SSH to the cluster with the DISPLAY environment variable set and launch a gnome-session:
+This will open a new X window of size 1024x768 at DISPLAY :1. Next, connect via SSH to the cluster with the `DISPLAY` environment variable set and launch a gnome-session:
 
 ```console
 local $ DISPLAY=:1.0 ssh -XC yourname@cluster-name.it4i.cz -i ~/.ssh/path_to_your_key