[gardening] Remove some obsolete doc notes related to the difference between Any and AnyObject (#841)

diff --git a/Foundation/NSBundle.swift b/Foundation/NSBundle.swift
index 17d1dc1..b0814fb 100644
--- a/Foundation/NSBundle.swift
+++ b/Foundation/NSBundle.swift
@@ -271,22 +271,16 @@
         return CFBundleGetIdentifier(_bundle)?._swiftObject
     }
     
-    /// - Experiment: This is a draft API currently under consideration for official import into Foundation
-    /// - Note: This API differs from Darwin because it uses [String : Any] as a type instead of [String : AnyObject]. This allows the use of Swift value types.
     open var infoDictionary: [String : Any]? {
         let cfDict: CFDictionary? = CFBundleGetInfoDictionary(_bundle)
         return _SwiftValue.fetch(cfDict) as? [String : Any]
     }
     
-    /// - Experiment: This is a draft API currently under consideration for official import into Foundation
-    /// - Note: This API differs from Darwin because it uses [String : Any] as a type instead of [String : AnyObject]. This allows the use of Swift value types.
     open var localizedInfoDictionary: [String : Any]? {
         let cfDict: CFDictionary? = CFBundleGetLocalInfoDictionary(_bundle)
         return _SwiftValue.fetch(cfDict) as? [String : Any]
     }
     
-    /// - Experiment: This is a draft API currently under consideration for official import into Foundation
-    /// - Note: This API differs from Darwin because it uses [String : Any] as a type instead of [String : AnyObject]. This allows the use of Swift value types.
     open func object(forInfoDictionaryKey key: String) -> Any? {
         if let localizedInfoDictionary = localizedInfoDictionary {
             return localizedInfoDictionary[key]
diff --git a/Foundation/NSFileManager.swift b/Foundation/NSFileManager.swift
index df4d0fd..cdeea4f 100644
--- a/Foundation/NSFileManager.swift
+++ b/Foundation/NSFileManager.swift
@@ -274,7 +274,6 @@
      
         This method replaces fileAttributesAtPath:traverseLink:.
      */
-    /// - Experiment: Note that the return type of this function is different than on Darwin Foundation (Any instead of AnyObject). This is likely to change once we have a more complete story for bridging in place.
     open func attributesOfItem(atPath path: String) throws -> [FileAttributeKey : Any] {
         var s = stat()
         guard lstat(path, &s) == 0 else {
diff --git a/Foundation/NSJSONSerialization.swift b/Foundation/NSJSONSerialization.swift
index 3d6d607..8b97994 100644
--- a/Foundation/NSJSONSerialization.swift
+++ b/Foundation/NSJSONSerialization.swift
@@ -157,7 +157,6 @@
     /* Create a Foundation object from JSON data. Set the NSJSONReadingAllowFragments option if the parser should allow top-level objects that are not an NSArray or NSDictionary. Setting the NSJSONReadingMutableContainers option will make the parser generate mutable NSArrays and NSDictionaries. Setting the NSJSONReadingMutableLeaves option will make the parser generate mutable NSString objects. If an error occurs during the parse, then the error parameter will be set and the result will be nil.
        The data must be in one of the 5 supported encodings listed in the JSON specification: UTF-8, UTF-16LE, UTF-16BE, UTF-32LE, UTF-32BE. The data may or may not have a BOM. The most efficient encoding to use for parsing is UTF-8, so if you have a choice in encoding the data passed to this method, use UTF-8.
      */
-    /// - Experiment: Note that the return type of this function is different than on Darwin Foundation (Any instead of AnyObject). This is likely to change once we have a more complete story for bridging in place.
     open class func jsonObject(with data: Data, options opt: ReadingOptions = []) throws -> Any {
         return try data.withUnsafeBytes { (bytes: UnsafePointer<UInt8>) -> Any in
             let encoding: String.Encoding
diff --git a/Foundation/NSPropertyList.swift b/Foundation/NSPropertyList.swift
index 4f837f0..6eda275 100644
--- a/Foundation/NSPropertyList.swift
+++ b/Foundation/NSPropertyList.swift
@@ -67,7 +67,6 @@
         }
     }
 
-    /// - Experiment: Note that the return type of this function is different than on Darwin Foundation (Any instead of AnyObject). This is likely to change once we have a more complete story for bridging in place.
     open class func propertyList(from data: Data, options opt: ReadOptions = [], format: UnsafeMutablePointer<PropertyListFormat>?) throws -> Any {
         var fmt = kCFPropertyListBinaryFormat_v1_0
         var error: Unmanaged<CFError>? = nil