[mlir][scf] Fix typo in comment in BufferizableOpInterfaceImpl.cpp (NFC).

[ingomueller-net]

Single-character comment-only fix --> self-accepting.

mlir/lib/Dialect/SCF/Transforms/BufferizableOpInterfaceImpl.cpp

struct WhileOpInterface
   }
 
   /// Assert that yielded values of an scf.while op are equivalent to their
   /// corresponding bbArgs. In that case, the buffer relations of the
   /// corresponding OpResults are "Equivalent".
   ///
   /// If this is not the case, allocs+copies are inserted and yielded from
   /// the loop. This could be a performance problem, so it must be explicitly
-  /// activated with `alloc-return-allocs`.
+  /// activated with `allow-return-allocs`.
   ///
   /// Not: In contrast to scf::ForOp, scf::WhileOp has two regions and the
   /// equivalence condition must be checked for both.
   LogicalResult verifyAnalysis(Operation *op,
                                const AnalysisState &state) const {
     auto whileOp = cast<scf::WhileOp>(op);
     const auto &options =
         static_cast<const OneShotBufferizationOptions &>(state.getOptions());