Add documentation about labs(tag = )

[yutannihilation]

tag argument seems not documented in ?labs yet. Since tag is intended to be specified by labs(), I think this should be described here.

[clauswilke]

Maybe write "The plot tag appears at the top-left by default"?

[yutannihilation]

Thanks! Of course the position is changeable, but "by default" is not added to other labels like title, whose positions are also changeable. Does adding "by default" only to tag make sense?

[clauswilke]

Rereading it all in context, I'm fine with it as is.

One other small issue I noticed, however: In the "Details" section, there's a parenthesis that isn't closed: "You can also set axis and legend labels in the individual scales (using the first argument, the name." Would you mind closing it?

[yutannihilation]

Sure, will do later.

[yutannihilation]

Done!

[hadley]

@yutannihilation if you wanted to make it even better, I think labs() could use named arguments for title, caption etc. That'll make the function easier to use, and the documentation more clear.

[yutannihilation]

@hadley Thanks, agreed. I've wondered why they are not named args...🙄 Do you mean I should create another PR for this? If so, I'll try tomorrow. But, if you will do, I'm ok.

[hadley]

A PR would be awesome 😄 (and no rush, since this shouldn't affect any code; although it might be useful to have some tests to verify that)

[yutannihilation]

Sure!

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