Update zrange.md

[Andrei-Banu]

The last 2 examples have (empty array) as response in the cli. Updated the cli command to make sure there is data in the zset before querying it

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[enjoy-binbin]

i checked, this look right, thanks.

[itamarhaber]

Thanks @Andrei-Banu - much appreciated.

The root cause for this issue is that we've replaced the interactive examples' backend. The previous implementation treated all examples in a single page as a single session, whereas the current one treats every example - regardless of the page - as a session. Until we fix the backend (created an issue to track at redis/redis-clinterwebz#21), this is a good workaround so merging.