[basic.def] Remove incorrect grammarterm formatting for "declaration" #8337
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Fixes NB US 12-026 (C++26 CD).
Fixes https://github.com/cplusplus/nbballot/issues/601.
As explained in the NB comment,
\grammarterm{declaration}in this place is wrong because e.g. https://eel.is/c++draft/basic.def#2.5 (elaborated-type-specifier) is not grammatically a declaration, but it is a "declaration" (https://eel.is/c++draft/basic.pre#5.14).Paragraph 2 talks about "declarations" in general, not just about declarations, so it's wrong to use grammarterm font.