Update conformance table for P0641R2

Author: Colin Robertson

docs/overview/visual-cpp-language-conformance.md

@@ -1,7 +1,7 @@
 ---
 title: "Microsoft C++ language and standard library conformance table"
 description: "Table of Microsoft C++ conformance updates by Visual Studio version."
-ms.date: 03/10/2021
+ms.date: 05/17/2021
 ms.technology: "cpp-language"
 ---
 # Microsoft C++ language and standard library conformance table
@@ -89,6 +89,7 @@ For details on Visual Studio 2017 or Visual Studio 2019 MSVC conformance improve
 | &nbsp;&nbsp;[`P1009R2 Array size deduction in new-expressions`](https://wg21.link/P1009R2) | VS 2019 16.7 <sup>[17](#note_17)</sup> |
 | &nbsp;&nbsp;[`P1286R2 Contra CWG DR1778`](https://wg21.link/P1286R2) | VS 2019 16.8 <sup>[17](#note_17)</sup> |
 | __C++20 Core language features__ | __Supported__ |
+| &nbsp;&nbsp;[`P0641R2 const mismatch with defaulted copy constructor`](https://wg21.link/P0641R2) | VS 2015 <sup>[14](#note_14)</sup> |
 | &nbsp;&nbsp;[`P0704R1 Fixing const lvalue ref-qualified pointers to members`](https://wg21.link/p0704r1) | VS 2015 <sup>[14](#note_14)</sup> |
 | &nbsp;&nbsp;[`P1041R4 Make char16_t/char32_t string literals be UTF-16/32`](https://wg21.link/P1041R4) | VS 2015 <sup>[14](#note_14)</sup> |
 | &nbsp;&nbsp;[`P1330R0 Changing the active member of a union inside constexpr`](https://wg21.link/P1330R0) | VS 2017 15.0 <sup>[14](#note_14)</sup> |
@@ -164,7 +165,6 @@ For details on Visual Studio 2017 or Visual Studio 2019 MSVC conformance improve
 | &nbsp;&nbsp;[`P0784R7 More constexpr containers`](https://wg21.link/P0784R7) | VS 2019 16.9 <sup>[20](#note_20)</sup> |
 | &nbsp;&nbsp;[`P1141R2 Yet another approach for constrained declarations`](https://wg21.link/P1141R2) | VS 2019 16.9 <sup>[20](#note_20)</sup> |
 | &nbsp;&nbsp;[`P1668R1 Permitting unevaluated inline assembly in constexpr functions`](https://wg21.link/P1668R1) | VS 2019 16.9 <sup>[20](#note_20)</sup> |
-| &nbsp;&nbsp;[`P0641R2 const mismatch with defaulted copy constructor`](https://wg21.link/P0641R2) | Partial |
 | &nbsp;&nbsp;[`P0634R3 Down with typename!`](https://wg21.link/P0634R3) | No |
 | &nbsp;&nbsp;[`P0840R2 [[no_unique_address]] attribute`](https://wg21.link/P0840R2) | No |
 | &nbsp;&nbsp;[`P1064R0 Allowing virtual function calls in constant expressions`](https://wg21.link/P1064R0) | No |