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: https://github.com/Cuprate/cuprate/issues/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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