fix links (#3978)

.github/ISSUE_TEMPLATE/01_bug_report.yml

@@ -5,7 +5,7 @@ body:
   - type: markdown
     attributes:
       value: |
-        We welcome bug reports! Please see our [contribution guidelines](https://github.com/dotnet/r9/blob/main/CONTRIBUTING.md#writing-a-good-bug-report) for more information on writing a good bug report. This template will help us gather the information we need to start the triage process.
+        We welcome bug reports! Please see our [contribution guidelines](https://github.com/dotnet/extensions/blob/main/CONTRIBUTING.md#writing-a-good-bug-report) for more information on writing a good bug report. This template will help us gather the information we need to start the triage process.
   - type: textarea
     id: background
     attributes:

CONTRIBUTING.md

@@ -19,7 +19,7 @@
   + [Help Wanted (Up for Grabs)](#help-wanted-up-for-grabs)
   + [Contributor License Agreement](#contributor-license-agreement)
 
-You can contribute to R9 with issues, pull-requests, and general reviews of both issues and pull-requests. Simply filing issues for problems you encounter is a great way to contribute. Contributing implementations is greatly appreciated.
+You can contribute with issues, pull-requests, and general reviews of both issues and pull-requests. Simply filing issues for problems you encounter is a great way to contribute. Contributing implementations is greatly appreciated.
 
 ## Reporting Issues
 
@@ -31,7 +31,7 @@ The .NET codebase is distributed across multiple repositories in the [.NET organ
 
 * [dotnet/runtime](https://github.com/dotnet/runtime) .NET runtime, libraries and shared host installers.
 * [dotnet/aspnetcore](https://github.com/dotnet/aspnetcore) ASP.NET Core.
-* [azure/r9](https://github.com/azure/r9) R9 extensions for Azure.
+* [azure/dotnet-extensions-experimental](https://github.com/azure/dotnet-extensions-experimental) Extensions for Azure.
 
 ### Finding Existing Issues
 
@@ -167,7 +167,7 @@ There are lots of thoughts and [approaches](https://github.com/antlr/antlr4-cpp/
 
 ### Help Wanted (Up for Grabs)
 
-The team marks the most straightforward issues as [help wanted](https://github.com/dotnet/r9/labels/help%20wanted). This set of issues is the place to start if you are interested in contributing but new to the codebase.
+The team marks the most straightforward issues as [help wanted](https://github.com/dotnet/extensions/labels/help%20wanted). This set of issues is the place to start if you are interested in contributing but new to the codebase.
 
 ### Contributor License Agreement
 

README.md

@@ -16,7 +16,7 @@ The major functional areas this repo addresses are:
 - Testing: Dramatically simplifies testing around common .NET abstractions such as ILogger and the TimeProvider.
 
 [![Build Status](https://dev.azure.com/dnceng/internal/_apis/build/status/r9/dotnet-r9?branchName=main)](https://dev.azure.com/dnceng/internal/_build/latest?definitionId=1223&branchName=main)
-[![Help Wanted](https://img.shields.io/github/issues/dotnet/r9/help%20wanted?style=flat-square&color=%232EA043&label=help%20wanted)](https://github.com/dotnet/r9/labels/help%20wanted)
+[![Help Wanted](https://img.shields.io/github/issues/dotnet/extensions/help%20wanted?style=flat-square&color=%232EA043&label=help%20wanted)](https://github.com/dotnet/extensions/labels/help%20wanted)
 [![Discord](https://img.shields.io/discord/732297728826277939?style=flat-square&label=Discord&logo=discord&logoColor=white&color=7289DA)](https://aka.ms/dotnet-discord)
 
 ## How can I contribute?