iox-#743 Update integration test readme
iox-#743 Update integration test readme

Correct spelling mistakes, add new lines, update output snippets

Signed-off-by: Marika Lehmann <e8b333f663511ed6eb951a283e7f0df61714845a@apex.ai>

eclipse-iceoryx/iceoryx,eclipse-iceoryx/iceoryx,eclipse-iceoryx/iceoryx,eclipse-iceoryx/iceoryx