Update fbdv.md (#2215)

* Update fbdv.md

Co-authored-by: Nico Matentzoglu <nicolas.matentzoglu@gmail.com>
Co-authored-by: Deepak <deepakunni3@users.noreply.github.com>

Author: 3 people

ontology/fbdv.md

@@ -34,6 +34,12 @@ taxon:
   id: NCBITaxon:7227
   label: Drosophila
 tracker: http://purl.obolibrary.org/obo/fbdv/tracker
+usages:
+- description: Used to record stages in expression and phenotype curation
+  examples:
+  - description: Expression of DLP in embryonic/larval midgut primordium at embryonic stage 13 (http://purl.obolibrary.org/obo/FBdv_00005328) (Khare and Baumgartner, 2000)
+    url: https://flybase.org/reports/FBgn0041604#expression
+  user: http://flybase.org
 activity_status: active
 ---