Replace state_get_balance with query_balance

[ipopescu]

What does this PR fix/introduce?

Removing the "state_get_balance" documentation and examples, since it has been deprecated in favor of "query_balance".

• The examples in querying-network.md are the actual commands and responses.
• The examples in verify-transfer.md are taken from querying-network.md, but have been modified to fit the tutorial (using the same account hashes and state root hash, to match the transfer flow). Eventually, we need to refresh the entire tutorial with fresh examples.
• In minimal-compliance.md, I found the following explanation confusing, so I'd like to simplify it by removing the crossed-out section. If it adds value to this point, please let me know.
  chain_get_state_root_hash - The state root hash is one of the several global state identifiers used to query the network state after deployments, and the only way to do so in the context of state_get_balance and state_get_dictionary_item. A minimal SDK requires both dependent methods.

Closes #1253

Checklist

(Delete any that aren't relevant)

• Docs are successfully building - yarn install && yarn run build.
• My changes follow the Casper docs style guidelines.
• All technical procedures have been tested (if you want help with this, mention it in Reviewers).

Reviewers

@ACStoneCL

[github-actions]

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[ACStone-MTS]

Looks good to me! One suggestion that could go either way.