fix typo in job example

Author: alanssitis

content/en/examples/controllers/job.yaml

@@ -8,7 +8,7 @@ spec:
       containers:
       - name: pi
         image: perl:5.34
-        command: ["perl",  "-Mbignum=bpi", "-wle", "print bpi(2000)"]
+        command: ["perl",  "-Mbignum=bpi", "-wle", "'print bpi(2000)'"]
       restartPolicy: Never
   backoffLimit: 4