update comment in gamm module (#3103)

x/gamm/keeper/swap.go

@@ -92,7 +92,7 @@ func (k Keeper) SwapExactAmountOut(
 	return k.swapExactAmountOut(ctx, sender, pool, tokenInDenom, tokenInMaxAmount, tokenOut, swapFee)
 }
 
-// swapExactAmountIn is an internal method for swapping to get an exact number of tokens out of a pool,
+// swapExactAmountOut is an internal method for swapping to get an exact number of tokens out of a pool,
 // using the provided swapFee.
 // This is intended to allow different swap fees as determined by multi-hops,
 // or when recovering from chain liveness failures.