d2js: updating readme

Author: x-delfino

d2js/js/README.md

@@ -87,7 +87,7 @@ All [RenderOptions](#renderoptions) properties in addition to:
 - `pad`: Pixels padded around the rendered diagram [default: 100]
 - `scale`: Scale the output. E.g., 0.5 to halve the default size. The default will render SVG's that will fit to screen. Setting to 1 turns off SVG fitting to screen.
 - `forceAppendix`: Adds an appendix for tooltips and links [default: false]
-- `target`: Target board/s to render. If target ends with '*', it will be rendered with all of its scenarios, steps, and layers. Otherwise, only the target board will be rendered. Pass '*' to render all scenarios, steps, and layers. E.g. `target: 'layers.x.*'` to render layer 'x' with all of its children. Multi-board outputs are currently only supported for animated SVGs and so `animateInterval` must be set to a value greater than 0.
+- `target`: Target board/s to render. If target ends with '*', it will be rendered with all of its scenarios, steps, and layers. Otherwise, only the target board will be rendered. E.g. `target: 'layers.x.*'` to render layer 'x' with all of its children. Pass '*' to render all scenarios, steps, and layers. By default, only the root board is rendered. Multi-board outputs are currently only supported for animated SVGs and so `animateInterval` must be set to a value greater than 0 when targeting multiple boards.
 - `animateInterval`: If given, multiple boards are packaged as 1 SVG which transitions through each board at the interval (in milliseconds).
 - `salt`: Add a salt value to ensure the output uses unique IDs. This is useful when generating multiple identical diagrams to be included in the same HTML doc, so that duplicate IDs do not cause invalid HTML. The salt value is a string that will be appended to IDs in the output.
 - `noXMLTag`: Omit XML tag `(<?xml ...?>)` from output SVG files. Useful when generating SVGs for direct HTML embedding.