fix: replace deprecated invoke --wasm with deploy-then-invoke workflow#2220

kaankacar wants to merge 3 commits intomainstellar/stellar-docs:mainfrom

2212-stellar-contract-invoke---wasm-is-invalid-affects-6-example-contract-tutorialsstellar/stellar-docs:2212-stellar-contract-invoke---wasm-is-invalid-affects-6-example-contract-tutorialsCopy head branch name to clipboard