Fix bogus Name assignment in CreateStatistics

Apparently, it doesn't work to use a plain cstring as a Name datum: you
may end up having random bytes because of failing to zero the bytes
after the terminating \0, as indicated by valgrind.  I introduced this
bug in 5564c1181548, so backpatch this fix to REL_10_STABLE, like that
commit.

While at it, fix a slightly misleading comment, pointed out by David
Rowley.

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/1ffb63a2a1767c3dd0c7611bed6383bd37bfbce6

Modified Files
--------------
src/backend/commands/statscmds.c   | 7 +++++--
src/backend/parser/parse_utilcmd.c | 3 ++-
2 files changed, 7 insertions(+), 3 deletions(-)

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