Fix typos

Co-authored-by: Greg Lueck <gregory.m.lueck@intel.com>

Author: Mike Kinsner

adoc/chapters/programming_interface.adoc

@@ -6116,7 +6116,7 @@ if set final data is [code]#nullptr)#.
 
 To prevent race conditions between accesses to the host allocation owned by a
 [code]#buffer# in the <<sycl-runtime>> (e.g., by accessors) and in host code, it
-is necesssary to use manual synchronization though a [code]#host_accessor#, or
+is necessary to use manual synchronization through a [code]#host_accessor#, or
 by passing a [code]#std::mutex# to the [code]#buffer# constructor through a
 [code]#property#.