why syntax to execute Lua script is not as per redis document about redis HOT 2 CLOSED

I think this does conform to the documentation.
The eval command does not take a file name as parameters - it takes the actual script as a string.
So for example the following works:

redis-cli eval "return redis.call('set','foo','bar')" 0
OK
redis-cli eval "return redis.call('get','foo')" 0
"bar"

The --eval option is handled by redis-cli application. It reads the file content into a string, and then sends a eval command with the string.

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@HenryRawas, thanks for reply and sorry, I misinterpreted it.

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