fix: resolve hardcoded FIG_3 token reference in 2018 Technical Guidelines

Author: MatMatt

DOCS/products/2018_Technical_Guidelines_v1.qmd

@@ -315,7 +315,7 @@ The Sentinel-2 system is based on the concurrent operations of two identical sat
 
 [^4]: Copernicus Space Component Data Access
 
-![Figure 3: MSI Spectral-Bands versus Spatial Resolution [17].](FIG_3)
+![Figure 3: MSI Spectral-Bands versus Spatial Resolution [17].](2018_Technical_Guidelines_v1-media/img-c4d619539a45e1edf7d072402fcc0b91.png)
 
 ::: {.tbl-caption}
 ```{=typst}