Update _illustrative.md

Author: mfranzke

source/_patterns/icons/illustrative/_illustrative.md

@@ -8,6 +8,7 @@ SPDX-FileCopyrightText: 2025 DB Systel GmbH
 SPDX-License-Identifier: Apache-2.0
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+<!-- markdownlint-disable-next-line MD001 -->
 ### Usage
 
 You could reference the multicolor icons directly via the `<use>` HTML tag within the `<svg>` HTML tag, compare to the source code provided with this pattern, like e.g.: