[OPENMP] Fix comment, NFC.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@373210 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Sema/SemaOpenMP.cpp

@@ -170,7 +170,7 @@ private:
   OpenMPClauseKind ClauseKindMode = OMPC_unknown;
   Sema &SemaRef;
   bool ForceCapturing = false;
-  /// true if all the vaiables in the target executable directives must be
+  /// true if all the variables in the target executable directives must be
   /// captured by reference.
   bool ForceCaptureByReferenceInTargetExecutable = false;
   CriticalsWithHintsTy Criticals;