Scale gradient doc fix

[DarwinAwardWinner]

The documentation now mentions "continuous_scale" instead of "discrete_scale".

Fixes #1736.

[hadley]

@thomasp85 can you please help @DarwinAwardWinner finish this off? I think it's tangled up with #1735

[DarwinAwardWinner]

I think I fixed it. I forgot to branch off from your master branch instead of mine.

[thomasp85]

@hadley can I get some pointers to this? It seems your current preference is to remove ellipses where possible, but it is wildly inconsistent in the scales constructors.

Currently the following has all arguments spelled out:

• scale_*_date
• scale_*_datetime
• scale_size_continuous
• scale_radius

While the following uses ellipses:

• scale_*_brewer
• scale_*_distiller
• scale_alpha_*
• scale_size_discrete
• scale_size_area
• scale_shape
• scale_*_manual
• scale_linetype
• scale_*_identity
• scale_*_hue
• scale_*_grey
• scale_*_gradient

I can appreciate the wish to spell everything out in order for autocomplete to work etc, but I think we should port everything then, rather than fixing it here and there in related PR's such as this and #1735

[hadley]

Ok, then lets close this one and do all in one pass.

[hadley]

Oh, but this doc fix is still good

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