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C-API docs: Clarify the size of arenas (#110895) 

Clarify the size of arenas

From 3.10.0 alpha 7, the pymalloc allocator uses arenas with a fixed size of 1
MiB on 64-bit platforms instead of 256 KiB on 32-bit platforms.
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@ -626,7 +626,8 @@ The pymalloc allocator
Python has a *pymalloc* allocator optimized for small objects (smaller or equal
to 512 bytes) with a short lifetime. It uses memory mappings called "arenas"
with a fixed size of 256 KiB. It falls back to :c:func:`PyMem_RawMalloc` and
with a fixed size of either 256 KiB on 32-bit platforms or 1 MiB on 64-bit
platforms. It falls back to :c:func:`PyMem_RawMalloc` and
:c:func:`PyMem_RawRealloc` for allocations larger than 512 bytes.
*pymalloc* is the :ref:`default allocator <default-memory-allocators>` of the