Merge #13707: tests: Add usage note to check-rpc-mappings.py
03a2d68010 Tests: add usage note to check-rpc-mappings.py (Mason Simon)
Pull request description:
This test would previously fail without a user-friendly warning message, if invoked with no arguments.
Test plan:
```
bitcoin @_@$ python3 test/lint/check-rpc-mappings.py
Usage: test/lint/check-rpc-mappings.py ROOT-DIR
bitcoin @_@$ echo $?
1
bitcoin @_@$ python3 test/lint/check-rpc-mappings.py .
* Checking consistency between dispatch tables and vRPCConvertParams
bitcoin @_@$ echo $?
0
```
Tree-SHA512: 0b7a94125d18ba5dbf3c3281a4af60718d2e495bf7645d7c2a3e1a2a1d80cffcea1383c90247186728037f1f2b38de75d0f59ccf7f792d69edd33884f3698c07
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