Merge pull request #11273 from natecook1000/nc-concrete-integer

[stdlib] Manually propagate integer documentation

Author: natecook1000

stdlib/public/core/FloatingPointTypes.swift.gyb

@@ -1403,8 +1403,8 @@ extension ${Self} {
 
   /// Creates a value that exactly represents the given integer.
   ///
-  /// If the given integer is outside the representable range of this type, the
-  /// result is `nil`.
+  /// If the given integer is outside the representable range of this type or
+  /// can't be represented exactly, the result is `nil`.
   ///
   /// - Parameter value: The integer to represent as a floating-point value.
 %   if srcBits < SignificandBitCount: