Updated the testing README

Former-commit-id: 7c07b45

Author: joncrlsn

test/README.md

@@ -1,6 +1,8 @@
-These are not automated tests (as much as I'd rather have automated tests), but manual
+These are not automated tests (I'd rather have automated tests), but manual
 integration tests for verifying that individual schema types are working.
 
+These can be good templates for isolating bugs in the different data diffs.
 
 Connect to the database manually:
   sudo su - postgres -- -c "psql -d db1"
+