Update free-programming-books-pl.md
Storage of "SQL i PL/SQL - podstawy" is down, so i added the same course but from the author's website. Also added wikibooks PERL course, and php course website.
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Storage of "SQL i PL/SQL - podstawy" is down, so i added the same course but from the author's website. Also added wikibooks PERL course, and php course website.