fix GRASS7 r.relief

Author: Giovanni Manghi

python/plugins/processing/algs/grass7/description/r.relief.txt

@@ -2,9 +2,9 @@ r.relief
 r.relief - Creates shaded relief from an elevation layer (DEM).
 Raster (r.*)
 ParameterRaster|input|Input elevation layer
-ParameterNumber|altitude|Altitude of the sun in degrees above the horizon|None|None|30.0
-ParameterNumber|azimuth|Azimuth of the sun in degrees to the east of north|None|None|270.0
+ParameterNumber|altitude|Altitude of the sun in degrees above the horizon|0|90|30.0
+ParameterNumber|azimuth|Azimuth of the sun in degrees to the east of north|0|360|270.0
 ParameterNumber|zscale|Factor for exaggerating relief|None|None|1.0
 ParameterNumber|scale|Scale factor for converting horizontal units to elevation units|None|None|1.0
-ParameterSelection|units|et scaling factor (applies to lat./long. locations only, none: scale=1)|none;meters;feet
+ParameterSelection|units|Elevation units (overrides scale factor)|intl;survey
 OutputRaster|output|Output shaded relief layer