Advances the descriptor's next-index counter by one.
Declared in <wallet/scriptpubkeyman.h>
[[requires_capability(0x7fb9552e1018), requires_capability(0x7fb94d1a11d8), requires_capability(0x7fb959e437f8), requires_capability(0x7fb97d4b7638), requires_capability(0x7fb95949cc78), requires_capability(0x7fb96668f5f8)]]
void
IncIndex();