docs(token-swap): drop 'no floats, no fixed-point' from README

That clause was saying *why we removed* the fixed crate, which belongs in
the changelog/PR description, not in the README that describes what the
code does. The positive half (u128 + checked arithmetic, matching
production Solana AMMs) is kept.

Author: Edward (Mike's bot)

tokens/token-swap/README.md

@@ -15,7 +15,7 @@ The pool keeps `x * y = K` invariant: if `x` is the reserve of token A and `y` i
 - Withdrawals proportional to LP-token share of the **effective reserves** (raw reserve minus admin's owed slice), so the admin's accrued fees don't dilute exiting LPs.
 - **Caller-supplied slippage floors on every state-changing instruction:** swaps revert with `SlippageExceeded` if the output falls below `min_output_amount`, deposits revert with `DepositBelowMinimum` if the LP mint amount falls below `minimum_lp_tokens_out`, withdrawals revert with `WithdrawalBelowMinimum` if either side falls below its floor.
 - **Defence-in-depth invariant check:** every swap re-verifies `effective_pool_a * effective_pool_b` doesn't decrease after the transfers, so a bug in the curve math fails the transaction instead of silently giving the trader too much.
-- All financial math in `u128` with checked arithmetic, matching how production Solana AMMs (Orca, Raydium, Meteora, Saber) do it. No floats, no fixed-point types for money.
+- All financial math in `u128` with checked arithmetic, matching how production Solana AMMs (Orca, Raydium, Meteora, Saber) do it.
 - Anchor 1.0 Rust [program](https://solana.com/docs/terminology#program) with LiteSVM integration tests.
 
 ## Why a CPAMM