fix broken link in synthesis.qmd

Author: gregorywaynepower

content/tutorials/earthworks/synthesis.qmd

@@ -72,7 +72,7 @@ Terrain Synthesis
 This tutorial can be run as a 
 [computational notebook](https://grass-tutorials.osgeo.org/content/tutorials/earthworks/synthesis.ipynb).
 Learn how to work with notebooks with the tutorial
-[Get started with GRASS & Python in Jupyter Notebooks](./get_started/fast_track_grass_and_python.qmd).
+[Get started with GRASS & Python in Jupyter Notebooks](./../get_started/fast_track_grass_and_python.qmd).
 :::
 
 # Setup
@@ -440,4 +440,4 @@ m.show()
 
 ![Terrain synthesis](images/synthesis_06.webp)
 
-![Volumetric change](images/synthesis_07.webp)
+![Volumetric change](images/synthesis_07.webp)