[css-fonts-4][css-fonts-5] make feature-* plural for consistency with Conditional 5 and 11.1 Font tech, fix w3c#7663

Author: svgeesus

css-fonts-4/Overview.bs

@@ -2065,11 +2065,11 @@ Then each component value is parsed according to this grammar:
 		| svg | truetype | woff | woff2 ]</pre>
 
 <pre class="prod"><dfn id="font-tech-values">&lt;font-tech&gt;</dfn>
-	 = [<<font-feature-tech>> | <<color-font-tech>>
+	 = [<<font-features-tech>> | <<color-font-tech>>
 		| variations | palettes | incremental ]</pre>
 
-<pre class="prod"><dfn id="font-feature-tech-values">&lt;font-feature-tech&gt;</dfn>
-	= [feature-opentype | feature-aat | feature-graphite]</pre>
+<pre class="prod"><dfn id="font-features-tech-values">&lt;font-features-tech&gt;</dfn>
+	= [features-opentype | features-aat | features-graphite]</pre>
 
 <pre class="prod"><dfn id="color-font-tech-values">&lt;color-font-tech&gt;</dfn>
 	= [color-COLRv0 | color-COLRv1 | color-SVG | color-sbix | color-CBDT ]</pre>

css-fonts-5/Overview.bs

@@ -364,11 +364,11 @@ Then each component value is parsed according to this grammar:
 		| svg | truetype | woff | woff2 ]</pre>
 
 <pre class="prod"><dfn id="font-tech-values">&lt;font-tech&gt;</dfn>
-	 = [<<font-feature-tech>> | <<color-font-tech>>
+	 = [<<font-features-tech>> | <<color-font-tech>>
 		| variations | palettes | incremental ]</pre>
 
-<pre class="prod"><dfn id="font-feature-tech-values">&lt;font-feature-tech&gt;</dfn>
-	= [feature-opentype | feature-aat | feature-graphite]</pre>
+<pre class="prod"><dfn id="font-features-tech-values">&lt;font-features-tech&gt;</dfn>
+	= [features-opentype | features-aat | features-graphite]</pre>
 
 <pre class="prod"><dfn id="color-font-tech-values">&lt;color-font-tech&gt;</dfn>
 	= [color-COLRv0 | color-COLRv1 | color-SVG | color-sbix | color-CBDT ]</pre>