Add `Fixing the FrameAllocator section
Add `Fixing the FrameAllocator section

Document changes from e3021d17d542e10328985ae5d0e0e373897835b3

phil-opp/blogOS,phil-opp/blog_os,phil-opp/blogOS,phil-opp/blog_os,phil-opp/blog_os,phil-opp/blog_os