pgsql: Fix documentation of FmgrInfo.fn_nargs.

Fix documentation of FmgrInfo.fn_nargs.

Some ancient comments claimed that fn_nargs could be -1 to indicate a
variable number of input arguments; but this was never implemented, and
is at variance with what we ultimately did with "variadic" functions.
Update the comments.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/d26b042ce577a4012b9798528f0b1bcfa6e502eb

Modified Files
--------------
src/backend/utils/fmgr/README | 2 +-
src/include/fmgr.h | 3 +--
2 files changed, 2 insertions(+), 3 deletions(-)

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