[clang] Update C++ DR status page (#131812)

CWG472 is one of the CWG issues that were assigned to Mike Miller with
`drafting` status, but recently got back to `open`, because Mike is no
longer active in CWG. Nothing to be done here, except for changing the
status.

CWG1432 was recently reopened after a CWG reflector discussion. I
changed the status to claim that we test for the previous resolution.

Author: Endilll

clang/test/CXX/drs/cwg14xx.cpp

@@ -57,7 +57,7 @@ namespace cwg1423 { // cwg1423: 11
 
 // cwg1425: na abi
 
-namespace cwg1432 { // cwg1432: 16
+namespace cwg1432 { // cwg1432: 16 open 2022-11-11
 #if __cplusplus >= 201103L
   namespace class_template_partial_spec {
     template<typename T> T declval();

clang/test/CXX/drs/cwg4xx.cpp

@@ -1062,7 +1062,7 @@ namespace cwg471 { // cwg471: 2.8
   //   expected-note@#cwg471-G-using {{declared private here}}
 } // namespace cwg471
 
-namespace cwg472 { // cwg472: no drafting 2011-04
+namespace cwg472 { // cwg472: no open 2011-04
 struct B {
   int i; // #cwg472-i
 };