Update documentation

  - Vanilla options
  - YoY convexity adjustment
  - Add first_time in FixedRateCoupon

docs/src/payoffs/payoffs.md

@@ -44,6 +44,22 @@ DiffFusion.Asset
 DiffFusion.ForwardAsset
 ```
 
+```@docs
+DiffFusion.AssetConvexityAdjustment
+```
+
+```@docs
+DiffFusion.ForwardIndex
+```
+
+```@docs
+DiffFusion.IndexConvexityAdjustment
+```
+
+```@docs
+DiffFusion.FutureIndex
+```
+
 ```@docs
 DiffFusion.Fixing
 ```
@@ -62,6 +78,14 @@ DiffFusion.ScalarValue
 DiffFusion.UnaryNode
 ```
 
+```@docs
+DiffFusion.Exp
+```
+
+```@docs
+DiffFusion.Log
+```
+
 ```@docs
 DiffFusion.Pay
 ```
@@ -166,6 +190,12 @@ DiffFusion.Swaption(
 ```
 
 
+## Asset Option Payoffs
+
+```@docs
+DiffFusion.VanillaAssetOption
+```
+
 
 ## American Monte Carlo Payoffs
 

docs/src/products/products.md

@@ -57,6 +57,19 @@ DiffFusion.OptionletCoupon(
     )
 ```
 
+```@docs
+DiffFusion.RelativeReturnCoupon
+```
+
+```@docs
+DiffFusion.RelativeReturnIndexCoupon
+```
+
+```@docs
+DiffFusion.VanillaAssetOptionFlow
+```
+
+
 ## Cash Flow and Coupon Methods
 
 ```@docs

src/products/RatesCoupons.jl

@@ -4,6 +4,7 @@
         pay_time::ModelTime
         fixed_rate::ModelValue
         year_fraction::ModelValue
+        first_time::Union{ModelTime,Nothing}
     end
 
 A fixed rate coupon.