Update issue templates

Added C++23 new issue template

Author: TylerMSFT

.github/ISSUE_TEMPLATE/new-c---2020-stl-library-documentation-topic-.md

@@ -2,10 +2,9 @@
 name: 'New C++ 2020 STL library documentation topic '
 about: Create a C++ 2020 doc tracking work item
 title: ''
-labels: STL doc work, C++20
+labels: C++20, STL doc work
 assignees: ''
-milestone: backlog
-project: C++20
+
 ---
 
 ISO paper for this feature: [PaperID]()

.github/ISSUE_TEMPLATE/new-c---2023-stl-library-documentation-topic.md

@@ -0,0 +1,11 @@
+---
+name: New C++ 2023 STL library documentation topic
+about: Create an issue to track C++ 2023 STL doc work
+title: ''
+labels: C++23
+assignees: ''
+
+---
+
+ISO paper for this feature: [PaperID](http link to iso paper)
+First implemented in: VS 20YY major.minor