fix: the sdk node example

[DNR500]

JIra: LF-8254

Current working examples

• yarn example:swap will run examples/swap.ts
• yarn example:bridge will run examples/bridge.ts
• yarn example:multihop will run examples/multihop
• yarn example:klima will run examples/klimaRetireExactCarbon.ts
• yarn example:polynomial will run examples/polynomialDeposit.ts

I've done a simple updated readme as well