Update jaeger README to use correct parameters

[topher200]

This fixes two separate documentation bugs:

1. When using the elasticsearch storage backend, storage.type=elasticsearch must be set. The given example didn't include this param.
2. The param names for the query service didn't match the ones in the code.

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[topher200]

/assign @sameersbn

[timstoop]

/lgtm

[unguiculus]

/lgtm

[unguiculus]

/assign

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: timstoop, topher200, unguiculus

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