Regarding that Bitcoin Core switched to bech32 as the default format for addresses recently (with release 0.19.0.1), this should also be reflected in the RPC help texts. The change was already done for the RPCs getaddressinfo (commit https://github.com/bitcoin/bitcoin/commit/2ee0cb3330ccf70f0540cb42370796e32eff1569 by jonatack, PR #17283) and validateaddress (commit https://github.com/bitcoin/bitcoin/pull/18122/commits/7f1475c7119e8c72bce39a63386a6ca859066b80 by my humble self, PR https://github.com/bitcoin/bitcoin/pull/18122/), but there are still some RPCExamples around with Base58 addresses, i.e.
setlabelsendtoaddressgetreceivedbyaddress- …..
All those legacy address usages should be identified and substituted by bech32 addresses where it makes sense (note that e.g. for signmessage and verifymessage there is as far as I know no possibility to sign with segwit addresses yet, hence the legacy addresses should stay). For the address, the newly introduced string constant EXAMPLE_ADDRESS (in src/rpc/util.h) can be used, which contains an illegal bech32 address.
Useful skills:
Basic understanding of address formats.
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