Merge "SHOW CREATE X" into one single page "SHOW CREATE"

[xxchan]

a little problem: Can we give “CREATE X” a larger priority over “SHOW CREATE X”? Because I guess the former is far more useful than the latter one.
(Alternatively, perhaps we can merge all these “SHOW CREATE X” into one single page, because there usages are exactly the same, and don’t need much explanation)

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