Update cwinthread-class.md

Editorial tweaks.
Add comment about object ownership and deletion.

Author: Colin Robertson

docs/mfc/reference/cwinthread-class.md

@@ -259,7 +259,7 @@ BOOL m_bAutoDelete;
 
 The `m_bAutoDelete` data member is a public variable of type BOOL.
 
-The value of `m_bAutoDelete` does not affect how the underlying thread handle is closed, but it will affect the timing of closing the handle. The thread handle is always closed when the `CWinThread` object is destroyed.
+The value of `m_bAutoDelete` doesn't affect how the underlying thread handle is closed, but it does affect the timing of closing the handle. The thread handle is always closed when the `CWinThread` object is destroyed.
 
 ##  <a name="m_hthread"></a>  CWinThread::m_hThread
 
@@ -271,9 +271,9 @@ HANDLE m_hThread;
 
 ### Remarks
 
-The `m_hThread` data member is a public variable of type HANDLE. It is only valid if underlying kernel thread object currently exists and the handle has not yet been closed.
+The `m_hThread` data member is a public variable of type HANDLE. It's only valid if underlying kernel thread object currently exists, and the handle hasn't been closed yet.
 
-The CWinThread destructor will call CloseHandle on this variable. If [m_bAutoDelete](#m_bautodelete) is TRUE when the thread terminates, the CWinThread object will be destroyed, making any pointers to the CWinThread object and its member variables invalid. Therefore, if you intend to use the m_hThread member after starting or resuming the thread execution (such as to wait for it to be signaled), make sure to set m_bAutoDelete to FALSE before allowing thread execution to continue, or it may terminate and destroy the CWinThread object and close the handle before you try to use it.
+The CWinThread destructor calls CloseHandle on `m_hThread`. If [m_bAutoDelete](#m_bautodelete) is TRUE when the thread terminates, the CWinThread object is destroyed, which invalidates any pointers to the CWinThread object and its member variables. You may need the `m_hThread` member to check the thread exit value, or to wait for a signal. To keep the CWinThread object and its `m_hThread` member during thread execution and after it terminates, set `m_bAutoDelete` to FALSE before you allow thread execution to continue. Otherwise, the thread may terminate, destroy the CWinThread object, and close the handle before you try to use it. If you use this technique, you are responsible for deletion of the CWinThread object.
 
 ##  <a name="m_nthreadid"></a>  CWinThread::m_nThreadID
 
@@ -285,7 +285,7 @@ DWORD m_nThreadID;
 
 ### Remarks
 
-The `m_nThreadID` data member is a public variable of type DWORD. It is only valid if underlying kernel thread object currently exists.
+The `m_nThreadID` data member is a public variable of type DWORD. It's only valid if underlying kernel thread object currently exists.
 Also see remarks about [m_hThread](#m_hthread) lifetime.
 
 ### Example