docs: Update product_tags.yaml (#10175)

doc: Update product_tags.yaml

docs/api/ref/schemas/product_tags.yaml

@@ -5,10 +5,12 @@ properties:
 
   brands:
     type: string
+    description: List of brands (not taxonomized)
   brands_tags:
     type: array
     items:
       type: string
+      description: List of brands (tags, not taxonomized)
 
   categories:
     type: string
@@ -18,6 +20,7 @@ properties:
       type: string
   categories_lc:
     type: string
+    description: Categories language code
   categories_tags:
     type: array
     items:
@@ -27,6 +30,7 @@ properties:
     type: array
     items:
       type: string
+      description:  List of checkers (users who checked the product) tags
   cities:
     type: string
   cities_tags:
@@ -48,6 +52,7 @@ properties:
       type: string
   countries_lc:
     type: string
+    description: Countries language code
   countries_tags:
     type: array
     items:
@@ -65,7 +70,7 @@ properties:
   emb_codes:
     type: string
     description: |
-      Packager code.
+      Packager code. EMB is the French system of traceability codes for packager.
     example: EMB 2013330
   emb_codes_orig:
     type: string
@@ -111,4 +116,4 @@ properties:
   nutrient_levels_tags:
     type: array
     items:
-      type: string
+      type: string