Help text for `importaddress` referred to the first parameter as `script`, when in fact it's `address`. Calling with a script argument fails:

```
→ bcli -named importaddress script=2N3qhMpHK8WNo7wv87W9eHMgvGyJU1593Ei
error code: -8
error message:
Unknown named parameter script
→ bcli -named importaddress address=2N3qhMpHK8WNo7wv87W9eHMgvGyJU1593Ei
# success!
```

make check
./bitcoind
./bitcoin-cli help importaddress