An attempt to fix docs build

Author: AlexeySachkov

sycl/doc/developer/ContributeToDPCPP.md

@@ -40,7 +40,7 @@ to signify the component changed, e.g.: `[UR]`, `[CUDA]`, `[Doc]`.
 ## Release notes
 
 You are encouraged (but it is not required) to record your change into
-[release notes](/sycl/ReleaseNotes.md) under "Release notes for an upcoming
+[release notes](../../ReleaseNotes.md) under "Release notes for an upcoming
 release" section.
 
 A change should be noted there when:

sycl/doc/developer/WorkingOnAReleaseBranch.md

@@ -35,5 +35,5 @@ Features are generally more complicated then bug fixes and may require further
 bug fixes as well. Considering that release branches are intended to be stable,
 no new features are allowed to be added there.
 
-[contributing]: /llvm/CONTRIBUTING.md
-[contributing-to-dpcpp]: /sycl/doc/developer/ContributeToDPCPP.md
+[contributing]: ../llvm/CONTRIBUTING.md
+[contributing-to-dpcpp]: ./ContributeToDPCPP.md

sycl/doc/index.rst

@@ -67,3 +67,4 @@ Developer Documentation
    developer/ABIPolicyGuide
    developer/ContributeToDPCPP
    developer/KHRExtensions
+   developer/WorkingOnAReleaseBranch