search on observational products in cookbook

docs/source/guides/search/cookbook.rst

@@ -84,7 +84,7 @@ Search for all Observational Products targeting Bennu:
    :caption: curl command
    :substitutions:
 
-   curl --get 'https://pds.nasa.gov/api/search/|search_user_guide_api_version|/classes/collections' \
+   curl --get 'https://pds.nasa.gov/api/search/|search_user_guide_api_version|/classes/observationals' \
      --data-urlencode 'q=(ref_lid_target eq "urn:nasa:pds:context:target:asteroid.101955_bennu")'
 
 
@@ -101,7 +101,10 @@ Search all products which are referring to a given LID:
         --data-urlencode 'limit=200' \
         --data-urlencode 'q=((pds:Internal_Reference.pds:lid_reference eq "urn:nasa:pds:context:investigation:mission.orex") or (pds:Internal_Reference.pds:lid_reference like "urn:nasa:pds:context:investigation:mission.orex::*"))' | json_pp
 
-----
+Search only observational products
+----------------------------------
+
+Search observational products which target is
 
 Search for DOIs
 ===============