docs($q): describe your change...

@jsolis:
Each version has its own docs (each build actually). So, info regarding the 1.2.x branch should be on the 1.2.x docs (there is no point in having them on the 1.3.x docs as well).
Hm...I just noticed that a similar notice exists about `finally()`.

The way I see it, we should remove the `finally()` notice from 1.3.x docs and add a similar `catch()` notice in the 1.2.x docs.

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Let's wait and see what people think :smiling_imp: