doc: add float as an alias for double precision.

Although the "Floating-Point Types" section says that "float" data
type is taken to mean "double precision", this information was not
reflected in the data type table that lists all data type aliases.

Reported-by: [email protected]
Author: Euler Taveira <[email protected]>
Reviewed-by: Tom Lane <[email protected]>
Discussion: 
https://postgr.es/m/[email protected]
Backpatch-through: 13

Branch
------
REL_13_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/f9b09fe63cbc88319de7e15dbcc390775e31d56b

Modified Files
--------------
doc/src/sgml/datatype.sgml | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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