Mark language (YAML) on code blocks

Signed-off-by: Vaclav Dolezal <[email protected]>

README.md

@@ -11,7 +11,7 @@ Role Variables
 
 The variables that can be passed to this role are as follows:
 
-```
+```yaml
 # List of NTP servers
 timesync_ntp_servers:
   - hostname: foo.example.com   # Hostname or address of the server
@@ -59,7 +59,7 @@ Example Playbook
 
 Install and configure ntp to synchronize the system clock with three NTP servers:
 
-```
+```yaml
 - hosts: targets
   vars:
     timesync_ntp_servers:
@@ -76,7 +76,7 @@ Install and configure ntp to synchronize the system clock with three NTP servers
 Install and configure linuxptp to synchronize the system clock with a
 grandmaster in PTP domain number 0, which is accessible on interface eth0:
 
-```
+```yaml
 - hosts: targets
   vars:
     timesync_ptp_domains:
@@ -90,7 +90,7 @@ Install and configure chrony and linuxptp to synchronize the system clock with
 multiple NTP servers and PTP domains for a highly accurate and resilient
 synchronization:
 
-```
+```yaml
 - hosts: targets
   vars:
     timesync_ntp_servers: