[css-color-4][editorial] Consistently use color space, except in grammar

Author: svgeesus

css-color-4/Overview.bs

@@ -4603,7 +4603,7 @@ Color Interpolation</h2>
 			which will be <dfn export>carried forward</dfn></li>
 		<li>converting them to a given color space
 			which will be referred to as the <dfn export>interpolation color space</dfn> below.
-			If one or both colors are already in the interpolation colorspace,
+			If one or both colors are already in the interpolation color space,
 			this conversion changes any [=powerless=] components to [=missing=] values
 		</li>
 		<li>(if required) re-inserting [=carried forward=] values in the converted colors</li>
@@ -6277,7 +6277,7 @@ Serializing sRGB values</h3>
 
 	<!-- <div class="example" id="ex-srgb-alpha">
 		For example, a color picker has returned the following values, 
-		in the sRGB colorspace:
+		in the sRGB color space:
 
 		<pre lang-js>
 			[37, 164, 87, 237]
@@ -7191,7 +7191,7 @@ Changes</h2>
 	<!-- to 7 Feb 2024 -->
 	<li>Added steps for serializing a uint8_t alpha, moved from cssom-1</li>
 	<li>Restored parse-time clamping of HSL negative saturation to 0, which is current interop behavior from CSS Color 3</li>
-	<li>When interpolating, always convert colorspace, so that powerless components become missing</li>
+	<li>When interpolating, always convert color space, so that powerless components become missing</li>
 	<li>Clarified when alpha 1 is omitted from serialization</li>
 	<li>Removed redundant constraining of hue angles to [0,360] as this is already done.</li>
 	<li>Corrected description of ActiveCaption, which is a background. </li>