public static String escapeAtSignWithEntity(String contents) {
        return contents.replace("@", "&#064;");
    }
A function used to escape the {@literal @} sign of a documentation
comment with an HTML entity of {@literal &#064;}.

@param contents Contents to sanitize.
@return Returns the sanitized contents.
smithy-codegen-core/src/main/java/software/amazon/smithy/codegen/core/writer/JavaStyleDocumentationWriterBuilder.java