docs: more elaborate and hopefully clearer fold change transformation explanation

Author: dlaehnemann

workflow/resources/datavzrd/go-enrichment-template.yaml

@@ -136,8 +136,10 @@ views:
   go_terms_scatter:
     dataset: go_enrichment
     desc: ?f"The y-axis represents the False Discovery Rate (FDR), while the x-axis shows the effect of the GO term for the {wildcards.model} model as determined by goatools.
-      The effect is determined as the average of all the absolute fold changes (all fold changes transformed to be >1) across all genes in a GO term.
-      After averaging the fold changes, the result is transformed to the log2 scale for reporting (and for use in the pi values we also report).
+      The effect is determined as the average of all the absolute fold changes across all genes in a GO term.
+      Here, absolute means a log2 fold change above 0, or a fold change above 1.
+      Thus, for averaging, a fold change of 0.5 would become 2, a fold change of 0.25 would become 4.
+      After averaging the fold changes, the result is transformed back to the log2 scale for reporting (and for use in the pi values we also report).
       Each point corresponds to a GO term.
       Click on a GO term to highlight it in colour.
       Several GO terms can be selected at the same time by holding down the Shift key."