Update broken link to RAR target in Microsoft.Common.CurrentVersion.targets (dotnet#5386)

* Update broken link

* Update documentation/wiki/ResolveAssemblyReference.md

Co-authored-by: Rainer Sigwald <[email protected]>

Co-authored-by: Rainer Sigwald <[email protected]>

Author: vritant24

documentation/wiki/ResolveAssemblyReference.md

@@ -9,7 +9,7 @@ If you notice the ordering, ResolveAssemblyReferences is happening before Compil
 
 ## Source Code
 You can browse Microsoft's MSBuild targets online at:
-http://source.roslyn.io/#MSBuildFiles/C/ProgramFiles(x86)/MSBuild/14.0/bin_/amd64/Microsoft.Common.CurrentVersion.targets,1820
+https://github.com/microsoft/msbuild/blob/a936b97e30679dcea4d99c362efa6f732c9d3587/src/Tasks/Microsoft.Common.CurrentVersion.targets#L1991-L2140
 This is where the RAR task is invoked in the targets file.
 
 The source code for RAR is at:
@@ -149,4 +149,4 @@ There were recent fixes made to RAR to alleviate the situation. You can control
 
 A common situation is MSBuild gives a warning about different versions of the same assembly being used by different references. The solution often involves adding a binding redirect to the app.config file. 
 
-A useful way to investigate these conflicts is to search in MSBuild Structured Log Viewer for "There was a conflict". It will show you detailed information about which references needed which versions of the assembly in question.
+A useful way to investigate these conflicts is to search in MSBuild Structured Log Viewer for "There was a conflict". It will show you detailed information about which references needed which versions of the assembly in question.