Add minor fix to P1436 to crrect typo.

Author: AerialMantis

affinity/cpp-23/d1436r3.md

@@ -469,7 +469,7 @@ There are a number of additional features which we are considering for inclusion
 
 ## Iteration space subdivision property
 
-It is defined in this proposal for the `bulk_execution_affinity_t` properties that when the size in an invocation of `execution::bulk_execute` is greater than the *available concurrency* tthen it is implementation defined how that iteration space is subdivided into a consecutive sequence of work-items. The authors of this proposal intend to propose a follow up property for specifying how an iteration space should be subdivided into chunks in this case.
+It is defined in this proposal for the `bulk_execution_affinity_t` properties that when the size in an invocation of `execution::bulk_execute` is greater than the *available concurrency* then it is implementation defined how that iteration space is subdivided into a consecutive sequence of work-items. The authors of this proposal intend to propose a follow up property for specifying how an iteration space should be subdivided into chunks in this case.
 
 ## Migrating data