Fix white space

Project/Assets/ML-Agents/Examples/GridWorld/Scripts/GridAgent.cs

     [Tooltip("Selecting will turn on action masking. Note that a model trained with action " +
         "masking turned on may not behave optimally when action masking is turned off.")]
     public bool maskActions = true;
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     public GridGoal gridGoal;
 
     const int k_NoAction = 0;  // do nothing!