[doc] remove reference to pg_dump pre-8.1 switch behaviour

Hi

The pg_dump doc page [1], under the -t/--table option, contains a Note
documenting the behavioural differences introduced in PostgreSQL 8.2.

As it's been almost exactly 14 years since that note was added [2], I suggest
it can be removed entirely.

[1] https://www.postgresql.org/docs/current/app-pgdump.html
[2]
https://git.postgresql.org/gitweb/?p=postgresql.git;a=blobdiff;f=doc/src/sgml/ref/pg_dump.sgml;h=9aa4baf84e74817a3c3e8359b2c4c8a847fda987;hp=deafd7c9a989c2cbce3979d94416a298609f5e84;hb=24e97528631e7e810ce61fc0f5fbcaca0c001c4c;hpb=77d2b1b625c7decd7a25ec865bced3b927de6d4b


Regards

Ian Barwick


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