code: void addLiteral(Token literalContent) {
      checkArgument(literalContent.kind == SoyFileParserConstants.LITERAL_RAW_TEXT_CONTENT);
  
      maybeFinishBasic();
      // Note: the LITERAL_RAW_TEXT_CONTENT already has the correct image content (it matches the
      // closing {/literal} but excludes the actual closing tag).
      if (!literalContent.image.isEmpty()) {
        append(literalContent, literalContent.image);
      }
      discontinuityReason = Reason.LITERAL;
    }
docs: Add the content for a '{literal}...{/literal}' section.