daemon-rpc: small fixes

[hinto-janai]

What

Fixes small things and typos for daemon RPC documentation; does not require deeper review into monerod.

Fixes

Table of fixes in this PR, originally tracked here: Cuprate/cuprate#159.

Link	Notes
get_miner_data	Example uses non-standard 18082 for RPC port
flush_cache	Missing space between curl command and output in example
add_aux_pow	Missing space between curl command and output in example, extra ' at the end of curl command
submit_block	Missing ending } in example
get_block_template	Missing ending } in example
generateblocks	Missing ending } in example

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[nahuhh]

Just a heads up: We've started a repo at https://github.com/monero-project/monero-docs (currently using the test branch) and (eventually) plan to migrate all documentation there.

It's a fork of https://github.com/monerodocs/md, and still in infancy.