doc: rename original opengx PDF file

This is to make it clear that it's from 2012.
devkitPro · Jun 21, 2024 · 180adc0 · 180adc0
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commit 180adc0
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diff --git a/doc/opengx.pdf → doc/opengx_2012.pdf b/doc/opengx.pdf → doc/opengx_2012.pdf