docs(docs): 📝 add missing documentation for commands

docs/api/commands/unset-mark.md

@@ -1,5 +1,20 @@
 # unsetMark
+`unsetMark` will remove the mark from the current selection. Can also remove all marks across the current selection.
 
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+## Parameters
+`typeOrName: string | MarkType`
+
+The type of mark that should be removed.
+
+`options?: Record<string, any>`
+
+* `extendEmptyMarkRange?: boolean` - Removes the mark even across the current selection. Defaults to `false`
+
+## Usage
+```js
+// removes a bold mark
+editor.commands.unsetMark('bold')
+
+// removes a bold mark across the current selection
+editor.commands.unsetMark('bold', { extendEmptyMarkRange: true })
+```