[css-color-4] Correct step 4 of GMA, fix w3c#10226

Author: svgeesus

css-color-4/Overview.bs

@@ -5638,7 +5638,7 @@ Sample Pseudocode for the Binary Search Gamut Mapping Algorithm with Local MINDE
 			<li>set |chroma| to (|min| + |max|) /2</li>
 			<li>set the chroma component of |current| to |chroma|</li>
 			<li>if |min_inGamut| is true and also if inGamut(|current|) is true, set |min| to |chroma| and continue to repeat these steps</li>
-			<li>otherwise, if inGamut(|current|) is false carry out these steps:
+			<li>otherwise, carry out these steps:
 				<ol>
 					<li>set |clipped| to clip(|current|)</li>
 					<li>set |E| to delta(|clipped|, |current|)</li>