fix warnings
fix warnings

- fix warnings about local variable conflicts
- superscript footnote text

dsisnero/asciidoctor-pdf,mojavelinux/asciidoctor-pdf,hmflash/asciidoctor-pdf,hmflash/asciidoctor-pdf,abatalev/asciidoctor-pdf,asciidoctor/asciidoctor-pdf,mojavelinux/asciidoctor-pdf,dsisnero/asciidoctor-pdf,abatalev/asciidoctor-pdf,Hextremist/asciidoctor-pdf,asciidoctor/asciidoctor-pdf,Hextremist/asciidoctor-pdf