Broken pkgdown link example for pkgdown issue 763.
To reproduce.
Observed: this link https://github.com/JohnMount/BrokenLinkExample/blob/master/extras/Untitled.md works in README.md but is broken in docs/index.html.
Expected: link to work both places (i.e. not be re-written from .md to .html).
A work-around is to relpace ".md" with "%2Emd" to hide the links from the processor.
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