Remove edge from approval to proceed and cancel (#1397)

Removed added edges from `approval_node` node to `proceed` and `cancel`.
These edges are causing an error where the graph tries to update
`status` channel at the same time (in node `proceed` and `cancel`) Also
since we have `approval_node` already points to `proceed` and `cancel`,
adding these edges is unnecessary.

Error message if the example compiled without any changes:
`InvalidUpdateError: At key 'status': Can receive only one value per
step. Use an Annotated key to handle multiple values.`

## Overview
<!-- Brief description of what documentation is being added/updated -->
Updates the approve or reject example in LangGraph `interrupts`
documentation.

## Type of change
Fix bug

**Type:** [Replace with: New documentation page / Update existing
documentation / Fix typo/bug/link/formatting / Remove outdated content /
Other]

## Related issues/PRs
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## Checklist
<!-- Put an 'x' in all boxes that apply -->
- [ x ] I have read the [contributing guidelines](README.md)
- [  ] I have tested my changes locally using `docs dev`
- [  ] All code examples have been tested and work correctly
- [  ] I have used **root relative** paths for internal links
- [  ] I have updated navigation in `src/docs.json` if needed
- I have gotten approval from the relevant reviewers
- (Internal team members only / optional) I have created a preview
deployment using the [Create Preview Branch
workflow](https://github.com/langchain-ai/docs/actions/workflows/create-preview-branch.yml)

## Additional notes
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Author: AbdulrahmanAlGhofaily

src/oss/langgraph/interrupts.mdx

@@ -235,8 +235,6 @@ await graph.invoke(new Command({ resume: false }), config);
     builder.add_node("proceed", proceed_node)
     builder.add_node("cancel", cancel_node)
     builder.add_edge(START, "approval")
-    builder.add_edge("approval", "proceed")
-    builder.add_edge("approval", "cancel")
     builder.add_edge("proceed", END)
     builder.add_edge("cancel", END)