add clarification comment

client/components/codeEditor/extensions/customKeyMaps.js

@@ -25,6 +25,9 @@ export async function formatCSS(view) {
 			bracketSpacing: true,
 			endOfLine: 'lf'
 		});
+
+		//format manually single declaration rules to span one line.
+		//Prettier can't do it by default, this is crude but it works
 		formatted = formatted.replace(
 			/([^{]+)\{\s*\n\s*([^;\n]+:[^;\n]+;)\s*\n\s*\}/g,
 			(_, selector, decl)=>`${selector.trim()} { ${decl.trim()} }`