Fix typos throughout the license files that somehow I and my reviewers all missed! Thanks to Alex Bradbury for pointing this out, and the fact that I never added the intended `legacy` anchor to the developer policy. Add that anchor too. With hope, this will cause the links to all resolve successfully. llvm-svn: 351731 GitOrigin-RevId: 4a1b95bda0c444798a5240fe924dd127b776d12d