Reduce field length to fit in BQ

[sydneynotthecity]

PR Checklist

PR Structure

• This PR has reasonably narrow scope (if not, break it down into smaller PRs).
• This PR avoids mixing refactoring changes with feature changes (split into two PRs
  otherwise).
• This PR's title starts with the jira ticket associated with the PR.

Thoroughness

• This PR adds tests for the most critical parts of the new functionality or fixes.
• I've updated the docs and README with the added features, breaking changes, new instructions on how to use the repository.

Release planning

• I've decided if this PR requires a new major/minor/patch version accordingly to
  semver, and I've changed the name of the BRANCH to release/* , feature/* or patch/* .

What

The current dbt build is broken and cannot release or build a new docker image because field descriptions violate BigQuery field description limitations:

�[0m18:30:39  �[33m400 PATCH https://bigquery.googleapis.com/bigquery/v2/projects/test-hubble-319619/datasets/dbt_jenkins_crypto_stellar_dbt/tables/config_settings_current?prettyPrint=false: The description for field config_setting_id is too long. The maximum length is 1024 characters.�[0m
�[0m18:30:39  
�[0m18:30:39  �[33m400 PATCH https://bigquery.googleapis.com/bigquery/v2/projects/test-hubble-319619/datasets/dbt_jenkins_crypto_stellar_dbt/tables/accounts_current?prettyPrint=false: The description for field flags is too long. The maximum length is 1024 characters.�[0m
�[0m18:30:39  
�[0m18:30:39  �[33m400 PATCH https://bigquery.googleapis.com/bigquery/v2/projects/test-hubble-319619/datasets/dbt_jenkins_crypto_stellar_dbt/tables/trust_lines_current?prettyPrint=false: The description for field flags is too long. The maximum length is 1024 characters.�[0m

This PR resolves the violations by shortening the markdown used to generate tables. The change is visually ugly, but gets the fields under the 1024 character limit.

Why

The stellar-dbt repo persists docs to BigQuery and pushes any updates through this configuration: https://github.com/stellar/stellar-dbt/blob/master/dbt_project.yml#L68 The pipeline is broken because dbt is unable to persist the docs.

Known limitations

[TODO or N/A]