@Deprecated
    public CodeWriter onSectionAppend(String sectionName, Runnable writeAfter) {
        return onSection(sectionName, contents -> {
            writeWithNoFormatting(contents);
            writeAfter.run();
        });
    }
Appends to the contents of a named section.

<pre>{@code
writer.onSectionAppend("foo", () -> {
    writer.write("This text is added after the rest of the section.");
});
}</pre>

@param sectionName The name of the section to intercept.
@param writeAfter A runnable that appends to a section by mutating the writer.
@return Returns the CodeWriter.
@see AbstractCodeWriter#onSection(CodeInterceptor) as an alternative
         that allows more explicit whitespace handling.
smithy-utils/src/main/java/software/amazon/smithy/utils/CodeWriter.java