[QGIS-Developer] Finalising the changelog for 3.12

[Totò]

Hi Tim,
I added these:

Add json support to WMS GetLegendGraphic -
https://github.com/qgis/QGIS/pull/31747
add gdal_viewshed algorithm - https://github.com/qgis/QGIS/pull/32463
Add option to set color for rendering nodata pixels in raster layers -
https://github.com/qgis/QGIS/pull/31728

regards



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