12411fc917 Fix typo in deprecated BIP-32 type (matthiasdebernardini)
Pull request description:
In #2258 we attempted to add back in deprecated BIP-32 types - but we spelled the identifier incorrectly. The patch was then backported to the `0.31.x` branch in December but was only just noticed now.
Fix typo in deprecated type from `Extendend` -> `Extended`.
ACKs for top commit:
tcharding:
ACK 12411fc917
storopoli:
ACK 12411fc917
apoelstra:
ACK 12411fc917
Tree-SHA512: f70e8fe741740f62b29932d8ee84cbe7803cb71dfb0491d251c3a982ede07ea7a32b5ecdf569d6012ee05509e8182a439b022c606a2f01742f4908089edc85a9