Update docs/customization/excluding-packages-and-paths.md

[jwolf20]

This is a:

• bug fix PR with no breaking changes
• new functionality

Link to Issue

Description & motivation

The example provided for excluding an entire models directory will fail on any project that is following best practices for project layout.

The inclusion of a leading "/" before "models" requires the models directory to be contained within a sub-directory below the location of dbt_project.yml file; under the best practices layout of a dbt project the models directory and the dbt_project.yml file reside on the same level. The regex uses relative paths from the location of the dbt_project.yml file.

I was trying to following the example to exclude a folder of legacy models, but the models kept appearing in the evaluation outputs. Eventually I realized that the leading "/" before "models" was causing the issue. I hope to prevent others from repeating my mistake.

Integration Test Screenshot

Checklist

• I have verified that these changes work locally on the following warehouses (Note: it's okay if you do not have access to all warehouses, this helps us understand what has been covered)
  • BigQuery
  • Postgres
  • Redshift
  • Snowflake
  • Databricks
  • DuckDB
  • Trino/Starburst
• I have updated the README.md (if applicable)
• I have added tests & descriptions to my models (and macros if applicable)