[atomics.types.operations] Remove spurious paragraph break. (#1834)

Author: jensmaurer

source/atomics.tex

@@ -921,7 +921,6 @@
 machines, e.g., load-locked store-conditional machines. A
 consequence of spurious failure is that nearly all uses of weak compare-and-exchange
 will be in a loop.
-
 When a compare-and-exchange is in a loop, the weak version will yield better performance
 on some platforms. When a weak compare-and-exchange would require a loop and a strong one
 would not, the strong one is preferable.