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Issue description

oc get ..... -o jsonpath   is used in multiple exercises/labs without any explanation in the text as to what it is and how it works. It is not covered in the do188 class and I have not found any reference links referring to it in this class either.

In a developer class maybe it is not important enough to be discussed directly but at least there should be a link for students to discover more about it if they are interested (but as the technique is not even mentioned in the text then pointing the student to a reference from inside an exercise makes little sense) - or just make the command simpler and avoid the topic completely, even using just oc get and grep combination..... a technique that they would be expected to be familiar with

item 5.2 in GE 3.4
item 3.2 in GE 4.8
item 2.3 and 3.4 in GE 5.6
item  2.2, 4.1 and 5.1 in lab solution 7.5
Also in the description of webhook triggers at the end of section 4.5

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