Syntax highlighting of FAQ

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=== DEM confidence map ===

We rely on the Ames Stereopipline software to produce our DEMs,
which do not output information such as confidence map. They stated
in the past that producing this information was really hard in their
pipeline and was not planned in the foreseeable future.

=== DEM intermediary products ===

We do not provide intermediary products such as aligned left/right
images, raw or refined correlation results. Those products use a lot
of disk space and are sometime not straightforward to open and read.