Update doc.

Author: csyonghe

docs/stdlib-reference/types/Atomic/index.md

@@ -15,7 +15,12 @@ layout: stdlib-reference
 * [`exchange`](/slang/stdlib-reference/types/Atomic/exchange)
 * [`compareExchange`](/slang/stdlib-reference/types/Atomic/compareExchange)
 
-# extension Atomic\<T\>
+# Additional Members when T conforms to IArithmeticAtomicable
+
+## Description
+
+These addtional members are only available when `T` conforms to `IArithmeticAtomicable`.
+
 
 ## Generic Parameters
 
@@ -28,7 +33,12 @@ layout: stdlib-reference
 * [`max`](/slang/stdlib-reference/types/Atomic/max)
 * [`min`](/slang/stdlib-reference/types/Atomic/min)
 
-# extension Atomic\<T\>
+# Additional Members when T conforms to IBitAtomicable
+
+## Description
+
+These addtional members are only available when `T` conforms to `IBitAtomicable`.
+
 
 ## Generic Parameters
 

source/slang/core.meta.slang

@@ -2803,6 +2803,8 @@ struct Atomic<T : IAtomicable>
         MemoryOrder failOrder = MemoryOrder.Relaxed);
 }
 
+/// @title Additional Members when T conforms to IArithmeticAtomicable
+/// These addtional members are only available when `T` conforms to `IArithmeticAtomicable`.
 extension<T : IArithmeticAtomicable> Atomic<T>
 {
     __intrinsic_op($(kIROp_AtomicAdd))
@@ -2815,6 +2817,8 @@ extension<T : IArithmeticAtomicable> Atomic<T>
     [__ref] T min(T value, MemoryOrder order = MemoryOrder.Relaxed); // returns original value
 }
 
+/// @title Additional Members when T conforms to IBitAtomicable
+/// These addtional members are only available when `T` conforms to `IBitAtomicable`.
 extension<T : IBitAtomicable> Atomic<T>
 {
     __intrinsic_op($(kIROp_AtomicAnd))