[stdatomic.h.syn] Remove reference to std::memory_order_consume

Author: jensmaurer

source/threads.tex

@@ -6385,7 +6385,6 @@
 
 using std::@\libglobal{memory_order}@;             // \seebelow
 using std::@\libglobal{memory_order_relaxed}@;     // \seebelow
-using std::@\libglobal{memory_order_consume}@;     // \seebelow
 using std::@\libglobal{memory_order_acquire}@;     // \seebelow
 using std::@\libglobal{memory_order_release}@;     // \seebelow
 using std::@\libglobal{memory_order_acq_rel}@;     // \seebelow