Fix jsdoc in core/serialization/variables.js
Fix jsdoc in core/serialization/variables.js

rachel-fenichel/blockly,mark-friedman/blockly,google/blockly,mark-friedman/blockly,google/blockly,rachel-fenichel/blockly,mark-friedman/blockly,rachel-fenichel/blockly,mark-friedman/blockly,mark-friedman/blockly,google/blockly,rachel-fenichel/blockly,google/blockly,google/blockly,rachel-fenichel/blockly,rachel-fenichel/blockly,google/blockly,google/blockly,rachel-fenichel/blockly,mark-friedman/blockly