pgsql: doc: Clarify project naming

doc: Clarify project naming

Clarify the project naming in the history section of the docs
to match the recent license preamble changes.

Backpatch to all supported versions.

Author: Dave Page <dpage@pgadmin.org>
Reviewed-by: Daniel Gustafsson <daniel@yesql.se>
Discussion: /messages/by-id/CA+OCxozLzK2+Jc14XZyWXSp6L9Ot+3efwXUE35FJG=fsbib2EA@mail.gmail.com
Backpatch-through: 13

Branch
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REL_13_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/04e6ae91ac1655c1ec95daa76d492d05507dfa8d

Modified Files
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doc/src/sgml/history.sgml | 9 ++++-----
1 file changed, 4 insertions(+), 5 deletions(-)