[clang] [clang][docs] Add documentation for APValue constructors (PR #109994)

[via cfe-commits]

================
@@ -314,51 +314,91 @@ class APValue {
   DataType Data;
 
 public:
+  /// Creates an empty APValue of type None.
   APValue() : Kind(None) {}
+  /// Creates an integer APValue holding the given value.
   explicit APValue(APSInt I) : Kind(None) {
     MakeInt(); setInt(std::move(I));
   }
+  /// Creates a float APValue holding the given value.
   explicit APValue(APFloat F) : Kind(None) {
     MakeFloat(); setFloat(std::move(F));
   }
+  /// Creates an fixed-point APValue holding the given value.
   explicit APValue(APFixedPoint FX) : Kind(None) {
     MakeFixedPoint(std::move(FX));
   }
+  /// Creates a vector APValue with \p N elements. The elements
+  /// are read from \p E.
   explicit APValue(const APValue *E, unsigned N) : Kind(None) {
     MakeVector(); setVector(E, N);
   }
+  /// Creates an integer complex APValue with the given real and imaginary
+  /// values.
   APValue(APSInt R, APSInt I) : Kind(None) {
     MakeComplexInt(); setComplexInt(std::move(R), std::move(I));
   }
+  /// Creates a float complex APValue with the given real and imaginary values.
   APValue(APFloat R, APFloat I) : Kind(None) {
     MakeComplexFloat(); setComplexFloat(std::move(R), std::move(I));
   }
   APValue(const APValue &RHS);
   APValue(APValue &&RHS);
+  /// Creates an lvalue APValue without an lvalue path.
+  /// \param B The base of the lvalue.
+  /// \param O The offset of the lvalue.
+  /// \param N Marker. Pass an empty NoValuePath.
----------------
Sirraide wrote:

```suggestion
  /// \param N Marker. Pass an empty NoLValuePath.
```

https://github.com/llvm/llvm-project/pull/109994