Fix broken link markup

Not convinced this will do it, but giving it a try...

docs/sphinx/index.rst

@@ -67,7 +67,7 @@ For the most recent presentation on SimEng's progress and status, see:
 Release
 -------
 
-This is SimEng's first release, so should be considered alpha level software (version 0.8.0). We expect you to find issues, primarily in unimplemented instructions or unimplemented system calls. Please let us know when you hit these, either by submitting a pull request (PR), or by filing an issue on the Github repo. You can find the all the code and associated test suites for SimEng in the `GitHub repository <https://github.com/UoB-HPC/SimEng>`_. The file `RELEASE_NOTES.txt <https://github.com/UoB-HPC/SimEng/blob/main/RELEASE-NOTES.txt>`, found in the root of the project, explains the status of the project and includes other relevant information from the SimEng development team.
+This is SimEng's first release, so should be considered alpha level software (version 0.8.0). We expect you to find issues, primarily in unimplemented instructions or unimplemented system calls. Please let us know when you hit these, either by submitting a pull request (PR), or by filing an issue on the Github repo. You can find the all the code and associated test suites for SimEng in the `GitHub repository <https://github.com/UoB-HPC/SimEng>`_. The file `RELEASE_NOTES.txt <https://github.com/UoB-HPC/SimEng/blob/main/RELEASE-NOTES.txt>`_, found in the root of the project, explains the status of the project and includes other relevant information from the SimEng development team.
 
 SimEng is released under the same license as LLVM, the permissive `Apache 2.0 <https://www.apache.org/licenses/LICENSE-2.0>`_ license. We are passionate about enabling experimentation with computer architectures, and want users and developers in academic and industry to have complete freedom to use SimEng anyway they wish, including using it in commercial settings.