Add missing API docs

Author: Vaibhavdixit02

docs/src/API/ad.md

@@ -0,0 +1,25 @@
+# [Automatic Differentiation Construction Choice Recommendations](ad)
+
+The choices for the auto-AD fill-ins with quick descriptions are:
+
+  - `AutoForwardDiff()`: The fastest choice for small optimizations
+  - `AutoReverseDiff(compile=false)`: A fast choice for large scalar optimizations
+  - `AutoTracker()`: Like ReverseDiff but GPU-compatible
+  - `AutoZygote()`: The fastest choice for non-mutating array-based (BLAS) functions
+  - `AutoFiniteDiff()`: Finite differencing, not optimal but always applicable
+  - `AutoModelingToolkit()`: The fastest choice for large scalar optimizations
+  - `AutoEnzyme()`: Highly performant AD choice for type stable and optimized code
+
+## Automatic Differentiation Choice API
+
+The following sections describe the Auto-AD choices in detail.
+
+```@docs
+Optimization.AutoForwardDiff
+Optimization.AutoFiniteDiff
+Optimization.AutoReverseDiff
+Optimization.AutoZygote
+Optimization.AutoTracker
+Optimization.AutoModelingToolkit
+Optimization.AutoEnzyme
+```

docs/src/API/optimization_function.md

@@ -2,30 +2,4 @@
 
 ```@docs
 SciMLBase.OptimizationFunction
-```
-
-## Automatic Differentiation Construction Choice Recommendations
-
-The choices for the auto-AD fill-ins with quick descriptions are:
-
-  - `AutoForwardDiff()`: The fastest choice for small optimizations
-  - `AutoReverseDiff(compile=false)`: A fast choice for large scalar optimizations
-  - `AutoTracker()`: Like ReverseDiff but GPU-compatible
-  - `AutoZygote()`: The fastest choice for non-mutating array-based (BLAS) functions
-  - `AutoFiniteDiff()`: Finite differencing, not optimal but always applicable
-  - `AutoModelingToolkit()`: The fastest choice for large scalar optimizations
-  - `AutoEnzyme()`: Highly performant AD choice for type stable and optimized code
-
-## Automatic Differentiation Choice API
-
-The following sections describe the Auto-AD choices in detail.
-
-```@docs
-Optimization.AutoForwardDiff
-Optimization.AutoFiniteDiff
-Optimization.AutoReverseDiff
-Optimization.AutoZygote
-Optimization.AutoTracker
-Optimization.AutoModelingToolkit
-Optimization.AutoEnzyme
-```
+```

docs/src/API/optimization_state.md

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+# [OptimizationState](@id optstate)
+
+```@docs
+Optimization.OptimizationState
+```

docs/src/API/optimization_stats.md

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+# [OptimizationStats](@id optstats)
+
+```@docs
+SciMLBase.OptimizationStats
+```