pgsql: doc: Remove dead link

doc: Remove dead link

The link to the NIST web page about DES standards leads to nowhere, and
according to archive.org has been forwarded to an unrelated page for
many years. Therefore, just remove that link. More up to date
information can be found via Wikipedia, for example.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/8b896abe8eb5ff85ba92710e4a1f0f28097d3ac3

Modified Files
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doc/src/sgml/pgcrypto.sgml | 4 ----
1 file changed, 4 deletions(-)

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