[css-fonts-4] Corrected some broken links

Author: svgeesus

css-fonts-4/Overview.bs

@@ -6720,7 +6720,7 @@ Unknown OpenType language system tags are silently ignored, and do not affect
 glyph selection and placement.
 
 <div class="example" id="ex-related-language">
-The <a href="https://www.un.org/en/documents/udhr/index.shtml">Universal Declaration of
+The <a href="https://www.un.org/en/about-us/universal-declaration-of-human-rights">Universal Declaration of
 Human Rights</a> has been translated into a wide variety of languages.  In Turkish,
 Article 9 of this document might be marked up as below:
 
@@ -8073,7 +8073,7 @@ The System Font is the font which is used by the ''system-ui'' <a href="#system-
 	<code>Feat </code> and
 	<code>Sill </code> tables
 	as documented in the
-	<a href="https://scripts.sil.org/cms/scripts/render_download.php?site_id=nrsi&amp;format=file&amp;media_id=GraphiteBinaryFormat_3_0&amp;filename=GraphiteBinaryFormat_3_0.pdf">Graphite Table Format</a>.
+	<a href="https://graphite.sil.org/">Graphite Table Format</a>.
 	The section on [[#font-rend-props]] describes properties that interact with these facilities.
 
 	The 'variations' tech refers to the support of font variations,
@@ -8285,7 +8285,7 @@ values contained with a <code title="&#64;ornaments">@ornaments</code>
 <i title="feature_value_block">feature value block</i> and so forth.
 
 The <code>CSSFontFeatureValuesMap</code> interface uses the
-<a href="https://heycam.github.io/webidl/#es-maplike">default map class methods</a>
+<a href="https://webidl.spec.whatwg.org/#js-maplike">default map class methods</a>
 but the <code>set</code> method has different behavior.  It takes a sequence of unsigned integers and
 associates it with a given <code>featureValueName</code>. The method
 behaves the same as the default map class method