Add shell syntax highlighting and remove unnecessary spaces

Linking-other-devices-(Provisioning).md

@@ -3,21 +3,29 @@ Signal allows to link additional devices to your primary device. A "primary" pro
 
 * Connect to another device
 
-      signal-cli link -n "optional device name"
-        
+     ```shell
+     signal-cli link -n "optional device name"
+     ```
+
   This shows a `sgnl://linkdevice…` link; if you want to connect to another signal-cli instance, you can just use this link (see below for details). If you want to link to an mobile device, create a QR code with the link (e.g. with [qrencode](https://fukuchi.org/works/qrencode/)) and scan that in the Signal app.
 
   To request a link and display the resulting QR code image in a single command on linux:
          
-         signal-cli link -n "optional device name" | tee >(xargs -L 1 qrencode -t utf8)
+     ```shell
+     signal-cli link -n "optional device name" | tee >(xargs -L 1 qrencode -t utf8)
+     ```
 
   alternatively, you can try:
 
-         signal-cli link -n "optional device name" | xargs -L 1 qrencode -o /tmp/qrcode.png & while [ ! -f /tmp/qrcode.png ]; do sleep 1; done; xdg-open /tmp/qrcode.png
+     ```shell
+     signal-cli link -n "optional device name" | xargs -L 1 qrencode -o /tmp/qrcode.png & while [ ! -f /tmp/qrcode.png ]; do sleep 1; done; xdg-open /tmp/qrcode.png
+     ```
 
   or for newer versions on android:
 
-       signal-cli link -n "optional device name" | xargs -L 1 qrencode -o /tmp/qrcode.png --level=H -v 10 & while [ ! -f /tmp/qrcode.png ]; do sleep 1; done; xdg-open /tmp/qrcode.png
+     ```shell
+     signal-cli link -n "optional device name" | xargs -L 1 qrencode -o /tmp/qrcode.png --level=H -v 10 & while [ ! -f /tmp/qrcode.png ]; do sleep 1; done; xdg-open /tmp/qrcode.png
+     ```
 	
   Do not kill the `signal-cli link …` process until linking is finished; the process will exit when it's done. 
 	 
@@ -27,7 +35,9 @@ Signal allows to link additional devices to your primary device. A "primary" pro
 
 * Add another device
 
-      signal-cli -u USERNAME addDevice --uri "sgnl://linkdevice?…"
+     ```shell
+     signal-cli -u USERNAME addDevice --uri "sgnl://linkdevice?…"
+     ```
           
    The `sgnl://linkdevice?…` link is the one shown by the new signal-cli instance or contained in the QR code shown in Signal-Desktop or similar apps.
 
@@ -43,11 +53,15 @@ Signal allows to link additional devices to your primary device. A "primary" pro
 
   You cannot run two instances on the same machine, so use either a virtual machine or another physical machine for your secondary device. On the secondary machine, issue the command
 
-       signal-cli link -n "optional device name"
+     ```shell
+     signal-cli link -n "optional device name"
+     ```
 
   This will display the `sgnl://linkdevice?…` link. Then go back to the primary machine and issue the command
 
-      signal-cli -u USERNAME addDevice --uri "sgnl://linkdevice?…"
+     ```shell
+     signal-cli -u USERNAME addDevice --uri "sgnl://linkdevice?…"
+     ```
 
   This links the two instances. Now, on your secondary machine, you can run