[PATCH] doc: fix documentation of -Wsfinae-incomplete [PR123639]

[Giuseppe D'Angelo]

Hi,

Attached is a trivial doc fix, ok for trunk?

Thank you,
-- 
Giuseppe D'Angelo | giuseppe.dangelo@kdab.com | Senior Software Engineer
KDAB (France) S.A.S., a KDAB Group company
Tel. France +33 (0)4 90 84 08 53, http://www.kdab.com
KDAB - Trusted Software Excellence

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