[docs] [issue26576] Tweak wording of decorator docos

[Raymond Hettinger]

Raymond Hettinger added the comment:

Elsewhere we use "roughly equivalent to" instead of "broadly equivalent to".  The latter seems a little bit off the mark.

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nosy: +rhettinger

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26576>
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