fix: admin api link not opening first time (#407)

docs/api/administration/README.md

@@ -4,12 +4,12 @@ The Administration API includes the following documents.
 
 ## Administration Central Ledger API
 
-[The specification of the Central Ledger API](./central-ledger-api) introduces and describes the **Central Ledger API**. The purpose of the API is to enable Hub Operators to manage admin processes around:
+[The specification of the Central Ledger API](./central-ledger-api.md) introduces and describes the **Central Ledger API**. The purpose of the API is to enable Hub Operators to manage admin processes around:
 
 - Creating/activating/deactivating participants in the Hub
 - Adding and updating participant endpoint information
 - Managing participant accounts, limits, and positions
 - Creating Hub accounts
 - Performing Funds In and Funds Out operations
 - Creating/updating/viewing settlement models
-- Retrieving transfer details
+- Retrieving transfer details