Switch default branch to main (#10115)

changelog_unreleased/html/7865.md

@@ -9,7 +9,7 @@ Formatting of HTML class names will now keep classes on one line until the line
   class="SomeComponent__heading-row d-flex flex-column flex-lg-row justify-content-start justify-content-lg-between align-items-start align-items-lg-center"
 ></div>
 
-<!-- Prettier master -->
+<!-- Prettier main -->
 <div
   class="
     SomeComponent__heading-row