Remove obsolete comment from AddBufferToRing()

Commit 5e899859287 changed StrategyGetBuffer() to pin buffers using
CAS without acquiring the buffer header lock, but left
AddBufferToRing()'s comment about the lock unchanged. Remove the stale
paragraph.

Author: Chao Li <[email protected]>
Reviewed-by: Pierre Forstmann <[email protected]>
Discussion: 
https://www.postgresql.org/message-id/[email protected]
Backpatch-through: 19

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/8e997cb8c9ecc27e55e38bb42f1cefd5ef74c9a0

Modified Files
--------------
src/backend/storage/buffer/freelist.c | 3 ---
1 file changed, 3 deletions(-)

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