Doc: fix confusion about LEAKPROOF in syntax summaries.

The syntax summaries for CREATE FUNCTION and allied commands
made it look like LEAKPROOF is an alternative to
IMMUTABLE/STABLE/VOLATILE, when of course it is an orthogonal
option.  Improve that.

Per gripe from aazamrafeeque0.  Thanks to David Johnston for
suggestions.

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

Branch
------
REL_10_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/9c1c9b071690b3fe2d99b5cbfb82367103a480f2

Modified Files
--------------
doc/src/sgml/ref/alter_function.sgml  | 3 ++-
doc/src/sgml/ref/create_function.sgml | 7 ++++---
2 files changed, 6 insertions(+), 4 deletions(-)

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