doc: remove comment about using thread_local

Followup to https://github.com/bitcoin/bitcoin/pull/30095#discussion_r1605655974.

1 files changed, 2 insertions, 3 deletions

diff --git a/src/test/util/random.h b/src/test/util/random.h
index c910bd6a3a..18ab425e48 100644
--- a/src/test/util/random.h
+++ b/src/test/util/random.h
@@ -14,9 +14,8 @@
 /**
  * This global and the helpers that use it are not thread-safe.
  *
- * If thread-safety is needed, the global could be made thread_local (given
- * that thread_local is supported on all architectures we support) or a
- * per-thread instance could be used in the multi-threaded test.
+ * If thread-safety is needed, a per-thread instance could be
+ * used in the multi-threaded test.
  */
 extern FastRandomContext g_insecure_rand_ctx;