docs(docs): 📝 add missing documentation for commands

docs/api/commands/split-block.md

@@ -1,5 +1,16 @@
 # splitBlock
+`splitBlock` will split the current node into two nodes at the current [NodeSelection](https://prosemirror.net/docs/ref/#state.NodeSelection). If the current selection is not splittable, the command will be ignored.
 
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-:::
+## Parameters
+`options: Record<string, any>`
+
+* `keepMarks: boolean` - Defines if the marks should be kept or removed. Defaults to `true`.
+
+## Usage
+```js
+// split the current node and keep marks
+editor.commands.splitBlock()
+
+// split the current node and don't keep marks
+editor.commands.splitBlock({ keepMarks: false })
+```