Qt: Add note about quick menu to achievement settings

src/duckstation-qt/achievementsettingswidget.ui

@@ -129,14 +129,17 @@
    <item>
     <widget class="QLabel" name="label">
      <property name="text">
-      <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;DuckStation uses RetroAchievements as an achievement database and for tracking progress. To use achievements, please sign up for an account at &lt;a href=&quot;https://retroachievements.org/&quot;&gt;&lt;span style=&quot; text-decoration: underline; color:#0000ff;&quot;&gt;retroachievements.org&lt;/span&gt;&lt;/a&gt;.&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
+      <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p align=&quot;justify&quot;&gt;DuckStation uses RetroAchievements as an achievement database and for tracking progress. To use achievements, please sign up for an account at &lt;a href=&quot;https://retroachievements.org/&quot;&gt;&lt;span style=&quot; text-decoration: underline; color:#0000ff;&quot;&gt;retroachievements.org&lt;/span&gt;&lt;/a&gt;.&lt;/p&gt;&lt;p align=&quot;justify&quot;&gt;To view the achievement list in-game, press the hotkey for &lt;span style=&quot; font-weight:600;&quot;&gt;Open Quick Menu&lt;/span&gt; and select &lt;span style=&quot; font-weight:600;&quot;&gt;Achievements&lt;/span&gt; from the menu.&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
      </property>
      <property name="textFormat">
       <enum>Qt::RichText</enum>
      </property>
      <property name="wordWrap">
       <bool>true</bool>
      </property>
+     <property name="margin">
+      <number>8</number>
+     </property>
      <property name="openExternalLinks">
       <bool>true</bool>
      </property>