USAGOV-807-Banner-Line-Height: Update _uswds-theme-custom-styles.scss

[IsabelLaurenceau]

Jira Task

https://cm-jira.usa.gov/browse/USAGOV-807

Description

Added "line-height: 1.5;" for the paragraph classes in the banner.

Checklist for the Developer

• A link to the JIRA ticket has been added above.
• The JIRA ticket identifies the desired result of this change.
• The JIRA ticket contains clear acceptance criteria.
• The JIRA ticket contains clear testing steps.
• The JIRA ticket contains a description of "Done".
• Any preparation/installation/update steps required for this code to work properly (drush commands, scripts, configuration updates) are documented in the ticket.

Checklist for the Peer Reviewers

• The branch name of this PR matches the project standards.
• QA steps are followed and any changes to process are updated in the ticket.
• Code Standards are followed, there are no bad practices in use.
• Config changes (if any) include only necessary changes.
• No errors in Drupal or Client Browser.
• Code has been tested locally (if possible).
• Following AC and Testing Steps verify changes work as expected.
• There are no known side-effects outside of expected behavior.