Add description for XREAD new '+' special ID for last stream entry (#…

[ronen-kalish]

Adding description of the '+' new special stream ID for the XREAD command.
see redis/redis#13117

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[oranagra]

do we want to mention that the pattern is usually that you start iterating on a stream with + and then switch to $ on the next call?

[ronen-kalish]

I don't know if this is the common use-case, maybe sometimes users just need to peep at the last element and don't continue from there. But I can add a mention if you think it's required.

[oranagra]

@majklik, @guybe7 please advise.

[majklik]

One nice use case is the mentioned peek fro last value in multiple streams. In this case is perfect one time shoot with: XREAD STREAM streamA streamB streamC streamD + + + +
But for reliable reading of the content of streams, when I need to start from the last available value (which is my case), after the initial "XREAD STREAM streamA streamB streamC streamD + + + +" it is convenient to continue with the obtained IDs from the streams in the style: "XREAD STREAM streamA streamB streamC streamD idA idB idC idD". If the initial reading shows that one of the streams is empty, I will use 0 as the id for subsequent readings.

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[dwdougherty]

The changes in this PR will be merged on the new docs site.