Change Details

> From all RPCs in the "blockchain" category, getblockfilter is the only one where there is only a CLI example present but not a curl RPC example (all other RPCs in this category have either both or none). This PR adds the missing HelpExampleRpc string. This is a backport of Core PR18396

> From all RPCs in the "blockchain" category, getblockfilter is the only one where there is only a CLI example present but not a curl RPC example (all other RPCs in this category have either both or none). This PR adds the missing HelpExampleRpc string. This is a backport of Core [[https://github.com/bitcoin/bitcoin/pull/18396 | PR18396]]

> From all RPCs in the "blockchain" category, getblockfilter is the only one where there is only a CLI example present but not a curl RPC example (all other RPCs in this category have either both or none). This PR adds the missing HelpExampleRpc string. This is a backport of Core [[https://github.com/bitcoin/bitcoin/pull/18396 | PR18396]]