remove comment in NSLock.swift

Author: maartene

Sources/Foundation/NSLock.swift

@@ -49,7 +49,6 @@ private typealias _RecursiveMutexPointer = UnsafeMutablePointer<pthread_mutex_t>
 private typealias _ConditionVariablePointer = UnsafeMutablePointer<pthread_cond_t>
 #endif
 
-// fix for: https://github.com/apple/swift-corelibs-foundation/issues/4941
 open class NSLock: NSObject, NSLocking, @unchecked Sendable {
     internal var mutex = _MutexPointer.allocate(capacity: 1)
 #if os(macOS) || os(iOS) || os(Windows)