Various doc fixes.

Fix typo in NOTES.WIN: this -> these

Fix wrong capital letter in certificates.txt

Make number of characters in each line more even
Remove redundant empty line

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3986)