Merge pull request #227 from NHSDigital/default-branch-name

Default branch name: "master" to "main"

Author: iw-ezequiel

insights/review.md

@@ -85,7 +85,7 @@ Finally (and most importantly) identify actions to move the score upward.
   * It keeps us aligned and working well as a team.
   * It helps us share and resolve impediments.
 * All our code is stored in source control (e.g. git).
-  * We practice [trunk-based development](https://trunkbaseddevelopment.com/) using short-lived feature branches off master.
+  * We practice [trunk-based development](https://trunkbaseddevelopment.com/) using short-lived feature branches off the main branch.
   * All code must be reviewed before it is merged.
   * Tests must pass before code is merged.
 * We can see when the build has broken or tests are failing and we fix them before carrying on.

patterns/everything-as-code.md

@@ -19,7 +19,7 @@ Everything (including [infrastructure](../practices/cloud-services.md)) should b
 * All code is treated the same (e.g. application code, infrastructure code, test code, etc).
   * All code is [peer-reviewed](#code-review) and tested.
   * All code is version controlled.
-  * The mainline branch (e.g. `master`) is protected: no force-pushes are allowed and code reviews, tests and any other automated checks must pass before pull/merge requests can be merged. Administrators should be subject to the same rules.
+  * The mainline branch (e.g. `main`) is protected: no force-pushes are allowed and code reviews, tests and any other automated checks must pass before pull/merge requests can be merged. Administrators should be subject to the same rules.
   * In general, squash merges are preferred for cleaner history. This does rely on merges being small, as should be the practice in any case.
 * Code changes should be automatically checked for code quality using tools like [SonarQube](../tools/sonarqube.md) (as well as via IDE plugins).
 * Code should be automatically scanned for secrets or other sensitive data (see [security](../practices/security.md) for details)