doc: Update header file mention for CompareType

Commit 119fc30 moved CompareType to cmptype.h but the mention in
the docs still refered to primnodes.h

Author: Daisuke Higuchi <[email protected]>
Reviewed-by: Paul A Jungwirth <[email protected]>
Reviewed-by: Daniel Gustafsson <[email protected]>
Discussion: 
https://postgr.es/m/CAEVT6c8guXe5P=l_un5nuuzcgegbhnncp+y3tv2wbqh-xji...@mail.gmail.com
Backpatch-through: 18

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/b39013b7b1b116b5d9be51f0919b472b58b3a28d

Modified Files
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doc/src/sgml/gist.sgml | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

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