AIX: fix "function descriptors" typo

Change-Id: I92d4962354559990e346df7efae272ae1f74e528
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2431467Reviewed-by: Junliang Yan <junyan@redhat.com>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Milad Farazmand <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#70136}

src/heap/base/asm/ppc/push_registers_asm.cc

@@ -64,7 +64,7 @@ asm(
 #if defined(_AIX)
     // Set up TOC for callee.
     "  ld 2,8(5)                                       \n"
-    // AIX uses function decorators, which means that
+    // AIX uses function descriptors, which means that
     // pointers to functions do not point to code, but
     // instead point to metadata about them, hence
     // need to deterrence.