Update documentation to reflect capabilities of the latest SDKs

[tillrohrmann]

Some parts of our documentation are not yet updated wrt the capabilities of the latest SDKs. For example, it is no longer required to await a ctx.run() call before doing another context call as stated here https://docs.restate.dev/develop/ts/journaling-results#journaled-actions. It might be worth checking whether the new SDKs frees users from other practices that were required with older versions and are contained in our documentation.

cc @gvdongen, @slinkydeveloper, @igalshilman