docs: kmemleak: DEBUG_KMEMLEAK_EARLY_LOG_SIZE changed names

Commit c5665868183f ("mm: kmemleak: use the memory pool for early
allocations") renamed CONFIG_DEBUG_KMEMLEAK_EARLY_LOG_SIZE to
CONFIG_DEBUG_KMEMLEAK_MEM_POOL_SIZE. Update the documentation reference
to reflect that.

Fixes: c5665868183f ("mm: kmemleak: use the memory pool for early allocations")
Signed-off-by: Jeremy Cline <jcline@redhat.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
diff --git a/Documentation/dev-tools/kmemleak.rst b/Documentation/dev-tools/kmemleak.rst
index 3621cd5..3a289e8 100644
--- a/Documentation/dev-tools/kmemleak.rst
+++ b/Documentation/dev-tools/kmemleak.rst
@@ -69,7 +69,7 @@
 
 Memory may be allocated or freed before kmemleak is initialised and
 these actions are stored in an early log buffer. The size of this buffer
-is configured via the CONFIG_DEBUG_KMEMLEAK_EARLY_LOG_SIZE option.
+is configured via the CONFIG_DEBUG_KMEMLEAK_MEM_POOL_SIZE option.
 
 If CONFIG_DEBUG_KMEMLEAK_DEFAULT_OFF are enabled, the kmemleak is
 disabled by default. Passing ``kmemleak=on`` on the kernel command