auto-increment: change "continuous" to monotonic#4449
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What is changed, added or deleted? (Required)
The AUTO_INCREMENT doc used the word "continuous" when it should be "monotonic". Continuous means "without any abrupt changes", i.e. at a constant rate (which could be up or down). Auto_increment is not really constant - since restarts could make values jump quite a bit. So could requesting a new batch of cached values.
Monotonic means "either never decreases or never increases". Which is the property it guarantees on a per-server basis.
The language will need version-specific changes because it says "30 thousand by default", but it needs to be 30 thousand explicitly for 2.1 which does not support AUTO_ID_CACHE.
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