Unify the markdown links to the NOTES and README files

Unify the markdown links to the NOTES and README files

In many locations, the files have been converted to markdown
syntactically, but don't utilize the power of markdown yet.
Here, instead of just repeating the file name, the markdown link
now shows the title of the document.

Additionally, the notes are now reference in the same order in both
the README and the INSTALL file.

Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/14042)