Master podAntiAffinity example differs from client and data examples in helm/opendistro-es/values.yaml

[dale-c-anderson]

Describe the bug
I don't know enough about podAntiAffinity to be able to tell if this is actually a bug; it might just be a clarification issue.

All I know is that one of these things:

• Master podAntiAffinity example (missing weight)
• Client podAntiAffinity example (weighted)
• Data podAntiAffinity example (weighted)

is not like the other. On my cluster I used the weighted-style for all 3, which had the desired effect of distributing one master,client, and data pod to each worker node.

Is the master example different on purpose? It appears so, as all 3 podAntiAffinity blocks were originally added by @ashwinkumar12345 in the same commit and then later changed to example code instead, I just don't know the reasonig for it.

The kubernetes docs shows a weighted podAntiAffinity example, and I know there are other ways to do it. I just don't know which is the best way.

If someone more knowledgeable than me can tell me one way or the other, I'd be happy to submit a PR.