Refactor doc toggle button label changing

To separate concerns, instead of checking the state of `#toggle-all-docs` by looking at its label text, I add or remove a class `will-expand` depending on whether the button’s next click will expand everything. (The `if` statement’s two branches were swapped as part of this change.)

I moved the desired text values to a function `labelForToggleButton`, so changing the values will be easier. I also note in a comment the other file where the text is duplicated.

To allow the labels of both types of toggle buttons to be uniformly set, I added a `span.inner` to the global button too.

I split the template in `render.rs` into multiple lines to make room for the `span`, and that adds whitespace around the `[` and `]` text elements. That seems to be okay, though – the page still looks the same.

I updated the CSS styling for `.collapse-toggle > .inner` to add a little extra space around the symbol, to make minus signs easier to identify. (`#toggle-all-docs > .inner` does not need the same style, since its text size is bigger, so it naturally puts more space around the symbol.)

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