docs(root): align Asset Leasing entry with canonical terminology

The root README entry used 'SPL tokens', 'SPL collateral', and 'per-second
rent' which contradict the in-repo terminology cleanup: the program and
the asset-leasing README use 'token' (not 'SPL Token') and 'lease fee'
(not 'rent'). Rewrite the one-liner to match the canonical framing
(holders, short sellers, lease fee).

Flagged by Cursor Bugbot on PR #7.

Author: mikemaccana-edwardbot

README.md

@@ -24,7 +24,7 @@ Constant product AMM (x·y=k) — create liquidity pools, deposit and withdraw l
 
 ### Asset Leasing
 
-Fixed-term leasing of SPL tokens with SPL collateral, per-second rent, and Pyth-priced liquidation — lessors list tokens, lessees post collateral, keepers liquidate undercollateralised positions.
+Directional token lending with token collateral, per-second lease fees, and Pyth-priced liquidation. Holders rent out token inventory to short sellers, who post stable-asset collateral and borrow the asset they want to short; keepers liquidate undercollateralised positions.
 
 [⚓ Anchor](./defi/asset-leasing/anchor)