Merge pull request #60178 from amartini51/doc_fixes

Documentation fixes

Author: amartini51

stdlib/public/Concurrency/TaskGroup.swift

@@ -100,14 +100,14 @@ public func withTaskGroup<ChildTaskResult, GroupResult>(
 /// you can use a `for`-`await`-`in` loop:
 ///
 ///     var sum = 0
-///     for await result in group {
+///     for try await result in group {
 ///         sum += result
 ///     }
 ///
 /// If you need more control or only a few results,
 /// you can call `next()` directly:
 ///
-///     guard let first = await group.next() else {
+///     guard let first = try await group.next() else {
 ///         group.cancelAll()
 ///         return 0
 ///     }
@@ -580,7 +580,7 @@ public struct ThrowingTaskGroup<ChildTaskResult: Sendable, Failure: Error> {
   ///
   /// You can also use a `for`-`await`-`in` loop to collect results of a task group:
   ///
-  ///     for await try value in group {
+  ///     for try await value in group {
   ///         collected += value
   ///     }
   ///

stdlib/public/core/FloatingPoint.swift

@@ -328,7 +328,7 @@ public protocol FloatingPoint: SignedNumeric, Strideable, Hashable
   /// `infinity` is greater than this value.
   static var greatestFiniteMagnitude: Self { get }
 
-  /// The [mathematical constant π][wiki], approximately equal to 3.14159.
+  /// The mathematical constant pi (π), approximately equal to 3.14159.
   /// 
   /// When measuring an angle in radians, π is equivalent to a half-turn.
   ///
@@ -339,8 +339,6 @@ public protocol FloatingPoint: SignedNumeric, Strideable, Hashable
   ///
   ///     print(Double.pi)
   ///     // Prints "3.14159265358979"
-  ///
-  /// [wiki]: https://en.wikipedia.org/wiki/Pi
   static var pi: Self { get }
 
   // NOTE: Rationale for "ulp" instead of "epsilon":

stdlib/public/core/FloatingPointTypes.swift.gyb

@@ -41,8 +41,10 @@ def Availability(bits):
 
 if Self == 'Float16':
     SelfDocComment = '''\
-/// A half-precision (16b), floating-point value type.'''
-
+/// A half-precision (16b), floating-point value type.
+///
+/// `Float16` is available on Apple silicon,
+/// and unavailable on Intel when targeting macOS.'''
 elif Self == 'Float':
     SelfDocComment = '''\
 /// A single-precision, floating-point value type.'''
@@ -53,7 +55,11 @@ elif Self == 'Double':
 
 elif Self == 'Float80':
     SelfDocComment = '''\
-/// An extended-precision, floating-point value type.'''
+/// An extended-precision, floating-point value type.
+///
+/// `Float80` is available on Intel
+/// when the target system supports an 80-bit long double type,
+/// and unavailable on Apple silicon.'''
 
 else:
     raise ValueError('Unhandled float type.')

stdlib/public/core/KeyPath.swift

@@ -200,6 +200,14 @@ public class PartialKeyPath<Root>: AnyKeyPath { }
 internal enum KeyPathKind { case readOnly, value, reference }
 
 /// A key path from a specific root type to a specific resulting value type.
+///
+/// The most common way to make an instance of this type
+/// is by using a key-path expression like `\SomeClass.someProperty`.
+/// For more information,
+/// see [Key-Path Expressions][keypath] in *[The Swift Programming Language][tspl]*.
+///
+/// [keypath]: https://docs.swift.org/swift-book/ReferenceManual/Expressions.html#ID563
+/// [tspl]: https://docs.swift.org/swift-book/
 public class KeyPath<Root, Value>: PartialKeyPath<Root> {
   @usableFromInline
   internal final override class var _rootAndValueType: (

stdlib/public/core/Optional.swift

@@ -10,8 +10,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-/// A type that represents either a wrapped value or `nil`, the absence of a
-/// value.
+/// A type that represents either a wrapped value or the absence of a value.
 ///
 /// You use the `Optional` type whenever you use optional values, even if you
 /// never type the word `Optional`. Swift's type system usually shows the