[swell-foop] help: Remove invalid page IDs to pass "yelp-check validate"

[Andre Klapper <aklapper src gnome org>]

commit 3cea95a2fdc0b3d0a450ab5ebaf7e193d81d57e6
Author: Andre Klapper <a9016009 gmx de>
Date:   Mon Jul 6 21:26:26 2020 +0200

    help: Remove invalid page IDs to pass "yelp-check validate"

 help/C/index.page        | 2 +-
 help/C/playing-game.page | 2 +-
 help/C/preferences.page  | 2 +-
 help/C/score.page        | 2 +-
 4 files changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/help/C/index.page b/help/C/index.page
index cbf08af..65980e9 100644
--- a/help/C/index.page
+++ b/help/C/index.page
@@ -26,7 +26,7 @@
     Swell Foop
   </title>
   <p>Swell Foop is a puzzle game, previously known as Same GNOME. To learn more
-  about the game, Look at -> <link xref="Introduction">Game introduction</link>.</p>
+  about the game, check the <link xref="introduction">game introduction</link>.</p>
 
   <section id="play">
     <title>Playing Swell Foop</title>
diff --git a/help/C/playing-game.page b/help/C/playing-game.page
index 00f05ed..eb5998b 100644
--- a/help/C/playing-game.page
+++ b/help/C/playing-game.page
@@ -1,7 +1,7 @@
 <page xmlns="http://projectmallard.org/1.0/";
       xmlns:its="http://www.w3.org/2005/11/its";
       type="topic"
-      id="play">
+      id="playing-game">
 
   <info>
     <link type="guide" xref="index#play"/>
diff --git a/help/C/preferences.page b/help/C/preferences.page
index 026a692..08fe1ad 100644
--- a/help/C/preferences.page
+++ b/help/C/preferences.page
@@ -1,6 +1,6 @@
 <page xmlns="http://projectmallard.org/1.0/";
       type="topic"
-      id="settings">
+      id="preferences">
 
   <info>
     <link type="guide" xref="index#advanced-settings"/>
diff --git a/help/C/score.page b/help/C/score.page
index 1bb0e6a..b3bc822 100644
--- a/help/C/score.page
+++ b/help/C/score.page
@@ -1,7 +1,7 @@
 <page xmlns="http://projectmallard.org/1.0/";
       xmlns:its="http://www.w3.org/2005/11/its";
       type="topic"
-      id="scores">
+      id="score">
 
   <info>
     <link type="guide" xref="index#play"/>