Accept multiple paths or array of paths to depopulate

- `Document.depopulate()` now accepts an array of paths, e.g. `['some', 'path', 'other.path']`
- `Document.depopulate()` now accepts space separated paths, e.g. `'some path other.path'`
- Fixes #5797

lib/document.js

@@ -2592,12 +2592,17 @@ Document.prototype.populated = function(path, val, options) {
  */
 
 Document.prototype.depopulate = function(path) {
-  var populatedIds = this.populated(path);
-  if (!populatedIds) {
-    return;
+  if (typeof path === 'string') {
+    path = path.split(' ');
+  }
+  for (const p of path) {
+    var populatedIds = this.populated(p);
+    if (!populatedIds) {
+      continue;
+    }
+    delete this.$__.populated[p];
+    this.$set(p, populatedIds);
   }
-  delete this.$__.populated[path];
-  this.$set(path, populatedIds);
   return this;
 };