[Documentation] Markdown improvements n to s (#13948)

Signed-off-by: Jerome Luckenbach <github@luckenba.ch>

bundles/org.openhab.binding.orvibo/README.md

@@ -5,7 +5,7 @@ Primarily this was designed for S20 Wifi Sockets but other products using the sa
 
 ## Supported Things
 
-*   S20 Wifi Sockets
+- S20 Wifi Sockets
 
 ## Discovery
 
@@ -21,7 +21,7 @@ This is optional, it is recommended to let the binding discover and add Orvibo d
 To manually configure an S20 Thing you must specify its deviceId (MAC address).
 In the thing file, this looks like:
 
-```
+```java
 Thing orvibo:s20:mysocket [ deviceId="AABBCCDDEEFF"]
 ```
 
@@ -35,7 +35,7 @@ Thing orvibo:s20:mysocket [ deviceId="AABBCCDDEEFF"]
 
 ## Items:
 
-```
+```java
 Switch MySwitch              "Switch state [%s]"  { channel="orvibo:s20:mysocket:power" }
 ```
 
@@ -44,7 +44,7 @@ Switch MySwitch              "Switch state [%s]"  { channel="orvibo:s20:mysocket
 Using the above things channels and items
 Sitemap:
 
-```
+```perl
 sitemap demo label="Main Menu" {
         Frame  {
                 Switch item=MySwitch