docs: add jq doc for editing genesis file

[atheeshp]

Description

Closes: #9908

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[amaury1093]

lgtm

[anilcse]

lgtm. I believe providing a list of jq and sed commands to override some default settings would be handy. Like exposing grpc, rosetta, inflation, voting_period etc.

[orijbot]

Visit https://dashboard.github.orijtech.com?pr=9918&remote=false&repo=cosmos%2Fcosmos-sdk to see benchmark details.

[amaury1093]

Looks good! @atheeshp feel free to put automerge once my last review is addressed