use ActivityPub instead of Fediverse

to be consistent

includes/class-admin.php

@@ -149,7 +149,7 @@ class Admin {
 
 	public static function add_fediverse_profile( $user ) {
 		?>
-		<h2 id="fediverse"><?php \esc_html_e( 'Fediverse', 'activitypub' ); ?></h2>
+		<h2 id="activitypub"><?php \esc_html_e( 'ActivityPub', 'activitypub' ); ?></h2>
 		<?php
 		\Activitypub\get_identifier_settings( $user->ID );
 	}

templates/welcome.php

@@ -13,7 +13,7 @@
 			),
 			\Activitypub\get_webfinger_resource( wp_get_current_user()->ID ),
 			\get_author_posts_url( wp_get_current_user()->ID ),
-			\admin_url( 'profile.php#fediverse' )
+			\admin_url( 'profile.php#activitypub' )
 		);
 		?>
 	</p>