Merge bitcoin/bitcoin#26424: doc: correct deriveaddresses RPC name

0f38524 doc: correct deriveaddresses RPC name (Bitcoin Hodler)

Pull request description:

  There never was a `deriveaddress` RPC, from what I can tell. It was always called `deriveaddresses` (plural).

ACKs for top commit:
  theStack:
    ACK 0f38524
  Zero-1729:
    ACK 0f38524

Tree-SHA512: 3f405f5479a0d39cf150fd80b4d854ffe4eef718a358202c619e34a08d98c1252b82fc70d106cdf2215dc5a50c6f6cd5e26fe7ed87156f6b08f8e97d963affb7

Author: MacroFake

doc/descriptors.md

@@ -266,6 +266,6 @@ ones. For larger numbers of errors, or other types of errors, there is a
 roughly 1 in a trillion chance of not detecting the errors.
 
 All RPCs in Bitcoin Core will include the checksum in their output. Only
-certain RPCs require checksums on input, including `deriveaddress` and
+certain RPCs require checksums on input, including `deriveaddresses` and
 `importmulti`. The checksum for a descriptor without one can be computed
 using the `getdescriptorinfo` RPC.