Advances the descriptor's next-index counter by one.
Declared in <wallet/scriptpubkeyman.h>
[[requires_capability(0x7ff3718038b8), requires_capability(0x7ff365630d18), requires_capability(0x7ff35d350898), requires_capability(0x7ff365aaa808), requires_capability(0x7ff379b45c18), requires_capability(0x7ff37e1e22c8)]]
void
IncIndex();