docs: mention that you can merge multiple GMT files for fgsea

.test/config/config.yaml

@@ -91,6 +91,11 @@ enrichment:
     fdr_genes: 0.05
     fdr_go_terms: 0.05
   fgsea:
+    # If activated, you need to provide a GMT file with gene sets of interest.
+    # A GMT file can contain multiple gene sets. So if you want to test for
+    # enrichment in multiple sets of gene sets, please merge your gene sets
+    # into one GMT file and provide this here. Don't forget to document your
+    # gene set sources and to cite them upon publication.
     gene_sets_file: "ngs-test-data/ref/dummy.gmt"
     # tool is only run if set to `true`
     activate: true

.test/three_prime/config/config.yaml

@@ -91,6 +91,11 @@ enrichment:
     fdr_genes: 0.05
     fdr_go_terms: 0.05
   fgsea:
+    # If activated, you need to provide a GMT file with gene sets of interest.
+    # A GMT file can contain multiple gene sets. So if you want to test for
+    # enrichment in multiple sets of gene sets, please merge your gene sets
+    # into one GMT file and provide this here. Don't forget to document your
+    # gene set sources and to cite them upon publication.
     gene_sets_file: "config/gene_sets.gmt"
     # tool is only run if set to `true`
     activate: true

config/config.yaml

@@ -93,7 +93,11 @@ enrichment:
   fgsea:
     # tool is only run if set to `true`
     activate: false
-    # if activated, you need to provide a GMT file with gene sets of interest
+    # If activated, you need to provide a GMT file with gene sets of interest.
+    # A GMT file can contain multiple gene sets. So if you want to test for
+    # enrichment in multiple sets of gene sets, please merge your gene sets
+    # into one GMT file and provide this here. Don't forget to document your
+    # gene set sources and to cite them upon publication.
     gene_sets_file: "resources/gene_sets/dummy.gmt"
     fdr_gene_set: 0.05
     # minimum achievable p-value  (equivalent to the reciprocal of the number of permutations, see fgsea docs)