Akim Demaille 2d07940325 doc: clean up the C++ section ...

* doc/bison.texi: Minor fixes in typography.
It is no longer require to pass --defines for C++ (it was addressed
long ago).
No longer refer to the `variant` define variable, it was replaced by
`api.value.type variant`.
Prefer nullptr to 0 for the null pointer.
Use deftypeop for constructors.
(Complete Symbols): Give the expected signature of yylex.
Don't document the symbol_type constructors, as we want users to focus
on make_TOKEN.
Also show the case without locations.

2018-09-26 21:49:20 +02:00

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