name of above_18 example in advanced syntax for claims is potentially ambiguous

[Joseph Heenan]

The name above_18 for the example transformed claim in the spec is potentially ambiguous, particularly for some non-native English speakers (i.e. does it mean “18 and over” or “above 18 (exclusive)”.

People have a habit of copying the examples in specs so it may be worth renaming it to “18_or_over” or something similar.

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[Daniel Fett]

+1, good point

[Daniel Fett]

Fix Issue #1263, rename above_18 to age_18_or_over

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