message: doc: link to managing-wallets from doc readme
  This was forgotten in
diff: @@ -74,6 +74,7 @@ The Peercoin repo's [root README](/README.md) contains relevant information on t
  - [Fuzz-testing](fuzzing.md)
  - [I2P Support](i2p.md)
  - [Init Scripts (systemd/upstart/openrc)](init.md)
  +- [Managing Wallets](managing-wallets.md)
  - [PSBT support](psbt.md)
  - [Reduce Memory](reduce-memory.md)
  - [Reduce Traffic](reduce-traffic.md)
  