tutorial:  land height is "elevation", not "altitude"

This is a follow-on patch to 92c12e46d5.  In that patch, we renamed
"altitude" to "elevation" in the docs, based on these details:

   
https://mapscaping.com/blogs/geo-candy/what-is-the-difference-between-elevation-relief-and-altitude

This renames the tutorial SQL files to match the documentation.

Reported-by: [email protected]

Discussion: 
https://postgr.es/m/[email protected]

Backpatch-through: 9.6

Branch
------
REL_11_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/b463490f9061232f77941e9b369b9343117d5748

Modified Files
--------------
src/tutorial/advanced.source | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)

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