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

llvm-svn: 351731
GitOrigin-RevId: 4a1b95bda0c444798a5240fe924dd127b776d12d
1 file changed