[css-color-4] Fix up explanatory text for angle normalization pseudocode, w3c#8838

Author: svgeesus

css-color-4/Overview.bs

@@ -4906,7 +4906,7 @@ Hue Interpolation</h3>
 <h4 id="hue-longer">
 <dfn export>longer</dfn></h4>
 
-	Angles are adjusted so that |θ₂ - θ₁| ∈ {[-360, -180], [180, 360]}. In pseudo-Javascript:
+	Angles are adjusted so that |θ₂ - θ₁| ∈ {(-360, -180], [180, 360)}. In pseudo-Javascript:
 		<pre>
 		if (0 < θ₂ - θ₁ < 180) {
 			θ₁ += 360;
@@ -4919,7 +4919,7 @@ Hue Interpolation</h3>
 <h4 id="hue-increasing">
 <dfn export>increasing</dfn></h4>
 
-	Angles are adjusted so that |θ₂ - θ₁| ∈ [0, 360]. In pseudo-Javascript:
+	Angles are adjusted so that |θ₂ - θ₁| ∈ [0, 360). In pseudo-Javascript:
 		<pre>
 		if (θ₂ < θ₁) {
 			θ₂ += 360;
@@ -4929,7 +4929,7 @@ Hue Interpolation</h3>
 <h4 id="hue-decreasing">
 <dfn export>decreasing</dfn></h4>
 
-	Angles are adjusted so that |θ₂ - θ₁| ∈ [-360, 0]. In pseudo-Javascript:
+	Angles are adjusted so that |θ₂ - θ₁| ∈ (-360, 0]. In pseudo-Javascript:
 		<pre>
 		if (θ₁ < θ₂) {
 			θ₁ += 360;