Update metadata in a couple of dotnet reference topics

Author: Rageking8

docs/dotnet/auto-gcroot-class.md

@@ -1,7 +1,7 @@
 ---
 title: "auto_gcroot Class"
 description: "Learn more about: auto_gcroot Class"
-ms.date: "01/16/2019"
+ms.date: 01/16/2019
 ms.topic: "reference"
 f1_keywords: ["msclr::auto_gcroot::auto_gcroot", "msclr::auto_gcroot::attach", "msclr::auto_gcroot::get", "msclr::auto_gcroot::release", "msclr::auto_gcroot::reset", "msclr::auto_gcroot::swap", "msclr::auto_gcroot::operator=", "msclr::auto_gcroot::operator->", "msclr::auto_gcroot::operator!", "msclr::auto_gcroot::operator auto_gcroot"]
 helpviewer_keywords: ["msclr::auto_gcroot"]

docs/dotnet/com-ptr-class.md

@@ -1,11 +1,10 @@
 ---
-description: "Learn more about: com::ptr Class"
 title: "com::ptr Class"
-ms.date: "01/16/2019"
+description: "Learn more about: com::ptr Class"
+ms.date: 01/16/2019
 ms.topic: "reference"
 f1_keywords: ["msclr::com::ptr::ptr", "msclr::com::ptr::Attach", "msclr::com::ptr::CreateInstance", "msclr::com::ptr::Detach", "msclr::com::ptr::GetInterface", "msclr::com::ptr::QueryInterface", "msclr::com::ptr::Release", "msclr::com::ptr::operator=", "msclr::com::ptr::operator->", "msclr::com::ptr::operator!"]
 helpviewer_keywords: ["msclr::ptr class"]
-ms.assetid: 0144d0e4-919c-45f9-a3f8-fbc9edba32bf
 ---
 # com::ptr Class
 

docs/dotnet/lock-class.md

@@ -1,11 +1,10 @@
 ---
-description: "Learn more about: lock Class"
 title: "lock Class"
-ms.date: "01/16/2019"
+description: "Learn more about: lock Class"
+ms.date: 01/16/2019
 ms.topic: "reference"
 f1_keywords: ["msclr::lock::lock", "msclr::lock::is_locked", "msclr::lock.is_locked", "msclr::lock::acquire", "msclr::lock::try_acquire", "msclr::lock::release", "msclr::lock::operator==", "msclr::lock::operator!="]
 helpviewer_keywords: ["msclr::lock class"]
-ms.assetid: 5123edd9-6aed-497d-9a0b-f4b6d6c0d666
 ---
 # lock Class