[llvm] [scudo] document allocation_ring_buffer_size (PR #71812)

[Mitch Phillips via llvm-commits]

================
@@ -250,6 +250,16 @@ The following "string" options are available:
 |                                 |                |                | can be attempted (a negative value disables     |
 |                                 |                |                | reclaiming).                                    |
 +---------------------------------+----------------+----------------+-------------------------------------------------+
+| allocation_ring_buffer_size     | 32768          | n/a            | When MTE is enabled, how many allocations to    |
----------------
hctim wrote:

"how many previous allocations to keep in the ring buffer"?

https://github.com/llvm/llvm-project/pull/71812