Documentation: application-developer: Clean up build instructions

The build and run instructions read as if meson is the only way to
compile the application. Although this is recommended, it is not
required - adapt the language to fit better.

While here, fix the naming of the simple_cam meson object to match
the other usages of 'simple-cam'.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

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