docs: Fix protocol version 3.2 message format of CancelRequest

Since protocol version 3.2 the CancelRequest does not have a fixed size
length anymore. The protocol docs still listed the length field to be a
constant number though. This fixes that.

Author: Jelte Fennema-Nio <[email protected]>
Reported-by: Dmitry Igrishin <[email protected]>
Backpatch-through: 18

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/d3ba50db48e66be8804b9edf093b0f921d625425

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

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