Update message that Main Thread Checker produces.

llvm-svn: 307464
diff --git a/lldb/source/Plugins/InstrumentationRuntime/MainThreadChecker/MainThreadCheckerRuntime.cpp b/lldb/source/Plugins/InstrumentationRuntime/MainThreadChecker/MainThreadCheckerRuntime.cpp
index 3c22b81..2ed7079 100644
--- a/lldb/source/Plugins/InstrumentationRuntime/MainThreadChecker/MainThreadCheckerRuntime.cpp
+++ b/lldb/source/Plugins/InstrumentationRuntime/MainThreadChecker/MainThreadCheckerRuntime.cpp
@@ -141,7 +141,7 @@
   d->AddStringItem("class_name", className);
   d->AddStringItem("selector", selector);
   d->AddStringItem("description",
-                   apiName + " must be called from main thread only");
+                   apiName + " must be used from main thread only");
   d->AddIntegerItem("tid", thread_sp->GetIndexID());
   d->AddItem("trace", trace_sp);
   return dict_sp;