Docs: clarified timeout unit in different places

[digital88]

#817

Docker API itself is a little inconsistent, it uses seconds here in stop https://docs.docker.com/reference/api/engine/version/v1.48/#tag/Container/operation/ContainerStop
and also seconds here in compose up/down https://docs.docker.com/reference/cli/docker/compose/down/

Docker is using nanoseconds in HEALTHCHECK (which testcontainers convert from milliseconds and pass down) here https://docs.docker.com/reference/api/engine/version/v1.48/#tag/Container/operation/ContainerCreate

Testcontainers APIs use millisecond consistently. I have documented timeout values to say which units they are expecting (seconds or millis, etc).

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