Doc: Fix ambiguous pronoun

[danielshahaf]

Clarify that the word it refers not to an exception but to an object.

[the-knights-who-say-ni]

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[danielshahaf]

@the-knights-who-say-ni My bpo credentials don't work and I'm unable to reset them, but in any case, please dispense with the CLA requirement for this one PR since the change is uncopyrightable and I don't have others coming up.