Changed title to Keys management

Author: grunch

src/SUMMARY.md

@@ -2,7 +2,7 @@
 
 [Home](./overview.md)
 
-- [Key management](./key_management.md)
+- [Keys management](./key_management.md)
 - [Creating a Sell order](./new_sell_order.md)
 - [Creating a Sell range order](./new_sell_range_order.md)
 - [Creating a Buy order](./new_buy_order.md)

src/key_management.md

@@ -1,4 +1,4 @@
-# Key management
+# Keys management
 
 _It is required to read [NIP-59 (gift wrap)](https://github.com/nostr-protocol/nips/blob/master/59.md) and [NIP-06](https://github.com/nostr-protocol/nips/blob/master/06.md) to fully understand this document_