Revised testing gate rationale. (#4336)

* Revised testing gate rationale.

* lint-fix

client-src/elements/gate-details.ts

@@ -292,8 +292,9 @@ const DEBUGGABILITY_GENERIC_RATIONALE = html`
 `;
 
 const TESTING_GENERIC_RATIONALE = html`
-  The testing review helps ensure that you are testing your feature using
-  current best practices.
+  The test review helps identify gaps in test coverage and ensures that all
+  crucial functionalities are thoroughly tested. This can lead to a more
+  polished final product and reduce the odds of missed defects and issues.
 `;
 
 export const GATE_RATIONALE: Record<number, TemplateResult> = {