Added needed single quotes. I've also moved `nginx` to the end of the line, to follow a more consistent syntax (`options` before `name|id`).
```
Usage: docker inspect [OPTIONS] NAME|ID [NAME|ID...]
Return low-level information on Docker objects
Options:
-f, --format string Format the output using the given Go template
-s, --size Display total file sizes if the type is container
--type string Return JSON for specified type
```
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