Advances the descriptor's next-index counter by one.
Declared in <wallet/scriptpubkeyman.h>
[[requires_capability(0x7fd7419bb0d8), requires_capability(0x7fd7453dbae8), requires_capability(0x7fd73d7927e8), requires_capability(0x7fd745b55638), requires_capability(0x7fd75f7ec628), requires_capability(0x7fd738e43b48)]]
void
IncIndex();