[QGIS-Developer] Processing Help system

[matteo]

> but yes, it's not an anchor that is created.

changing the file name works fine. I have locally

file:///home/matteo/lavori/QGIS/QGIS-Documentation/QGIS-Documentation/output/html/en/docs/user_manual/processing_algs/qgis/rasterterrainanalysis.html

but not for anchors that are still taken from the header

file:///home/matteo/lavori/QGIS/QGIS-Documentation/QGIS-Documentation/output/html/en/docs/user_manual/processing_algs/qgis/rasterterrainanalysis.html#hypsometric-curves

even if the anchor name is different:

.. _bla_bla_bla:

Hypsometric curves
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