Merged PR 2083: Add values to Stripe tests

There's a couple of broken tests for Stripe data in production for some `accepted_values` one, but it's just because our test is too strict and doesn't really account for all values.

This PR fixes plus drops a small comment on the funky sources table which won't hurt for future modelers.

models/staging/stripe/_stripe_sources.yml

@@ -3,6 +3,12 @@ version: 2
 # The design of this source was heavily inspired by this post:
 # https://discourse.getdbt.com/t/unioning-identically-structured-data-sources/921
 
+# It reads two different schemas (stripe_uk and stripe_us) that have exactly the
+# same table structure. To save work, we use YAML anchors (see the funny syntax)
+# under sources > stripe_uk > tables and sources > stripe_us > tables.
+# Basically, if you change anything in the stripe_uk section, changes will 
+# happen in both schemas.  
+
 sources:
   - name: stripe_uk
     description: Data from our Stripe UK account.
@@ -151,7 +157,9 @@ sources:
                       "refund",
                       "topup",
                       "dispute",
-                      "other_adjustment"
+                      "other_adjustment",
+                      "refund_failure",
+                      "dispute_reversal"
                     ]
           - name: _airbyte_raw_id
             data_type: character varying