Merge pull request #426 from tan9/markdown-syntax-highlight

Specify YAML formatting to all rules config.

docs/collector.cpu.md

@@ -47,7 +47,7 @@ sum by (mode) (irate(wmi_cpu_time_total{instance="localhost"}[5m]))
 
 ## Alerting examples
 **prometheus.rules**
-```
+```yaml
 # Alert on hosts with more than 80% CPU usage over a 10 minute period
 - alert: CpuUsage
   expr: 100 - (avg by (instance) (irate(wmi_cpu_time_total{mode="idle"}[2m])) * 100) > 80

docs/collector.logical_disk.md

@@ -49,7 +49,7 @@ rate(wmi_logical_disk_reads_total{instance="localhost", volume="C:"}[2m]) + rate
 
 ## Alerting examples
 **prometheus.rules**
-```
+```yaml
 groups:
 - name: Windows Disk Alerts
   rules:

docs/collector.os.md

@@ -43,7 +43,7 @@ wmi_os_timezone{timezone != "UTC"}
 
 ## Alerting examples
 **prometheus.rules**
-```
+```yaml
 # Alert on hosts that have exhausted all available physical memory
 - alert: MemoryExhausted
   expr: wmi_os_physical_memory_free_bytes == 0

docs/collector.service.md

@@ -79,7 +79,7 @@ count(wmi_service_state{exported_name=~"(sqlserveragent|mssqlserver)",state="run
 
 ## Alerting examples
 **prometheus.rules**
-```
+```yaml
 groups:
 - name: Microsoft SQL Server Alerts
   rules: