feat(markdown): Docs for new/updated core methods

markdown/dev/reference/api/snippet/asrenderprops/en.md

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+---
+title: Snippet.asRenderProps()
+---
+
+The `Snippet.asRenderProps()` method will return the data stored in the
+snippet as a serializable Javascript object. This method is typically
+not invoked directly but rather called under the hood as a result of
+calling [`Pattern.getRenderProps()`](/reference/core/pattern/getrenderprops).
+
+## Signature
+
+```js
+Object snippet.asRenderProps()
+```
+
+## Returned object properties
+
+This returns Javascript object has the following properties:
+
+| Name | Description |
+| ----:| ----------- |
+| `attributes` | The result of [Path.attributes.asRenderProps()](/reference/api/attribute/asrenderprops) |
+| `def` | The ID of the snippet's reference in the `defs` section of the SVG (the snippet code) |
+| `anchor` | The [Point](/reference/api/point) on which the snippet is anchored, or rather its [`Point.asRenderProps()`](/reference/api/point/asrenderprops) result |
+