fix "Contexts in which this element can be used:" of <table> element

[mtrootyy]

https://w3c.github.io/html/tabular-data.html#the-table-element

Contexts in which this element can be used:

• Where flow content is expected.

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The above should be fixed following;

Contexts in which this element can be used:

• Where flow content is expected, but with no caption element ancestors.

Ref: https://w3c.github.io/html/tabular-data.html#the-caption-element

Content model:

• Flow content, but with no main, or table element descendants.

[RizBizKits]

I'll get this fixed!