PDF links don't work in the help for IntelliJ IDEA

If you click a link to a PDF in the help for IntelliJ IDEA, the file name displays as a title in the right pane, but there's no text. This is an issue for users trying to access the C/C++ API reference manuals.

Workaround: You can access the Validate C/C++ AST API Reference and Validate C/C++ Path API Reference PDFs from the 'Writing custom checkers' page on the Documentation site.