refactor(editor): rename block-std to std (#11250)

Closes: BS-2946

blocksuite/docs/api/@blocksuite/std/gfx/functions/getTopElements.md

@@ -0,0 +1,36 @@
+[**BlockSuite API Documentation**](../../../../README.md)
+
+***
+
+[BlockSuite API Documentation](../../../../README.md) / [@blocksuite/std](../../README.md) / [gfx](../README.md) / getTopElements
+
+# Function: getTopElements()
+
+> **getTopElements**(`elements`): `GfxModel`[]
+
+Get the top elements from the list of elements, which are in some tree structures.
+
+For example: a list `[G1, E1, G2, E2, E3, E4, G4, E5, E6]`,
+and they are in the elements tree like:
+```
+    G1         G4      E6
+   /  \        |
+ E1   G2       E5
+      / \
+     E2  G3*
+        / \
+       E3 E4
+```
+where the star symbol `*` denote it is not in the list.
+
+The result should be `[G1, G4, E6]`
+
+## Parameters
+
+### elements
+
+`GfxModel`[]
+
+## Returns
+
+`GfxModel`[]