Update comments in block_events.js
Update comments in block_events.js

They were inverted.
rachel-fenichel/blockly,twodee/blockly,mark-friedman/blockly,rachel-fenichel/blockly,google/blockly,nickmain/blockly,google/blockly,twodee/blockly,mark-friedman/blockly,trinketapp/blockly,rachel-fenichel/blockly,picklesrus/blockly,mark-friedman/blockly,joshlory/blockly,google/blockly,twodee/blockly,picklesrus/blockly,mark-friedman/blockly,trinketapp/blockly,rachel-fenichel/blockly,google/blockly,nickmain/blockly,mark-friedman/blockly,rachel-fenichel/blockly,mark-friedman/blockly,google/blockly,google/blockly,joshlory/blockly,nickmain/blockly,trinketapp/blockly,nickmain/blockly,nickmain/blockly,trinketapp/blockly,nickmain/blockly,rachel-fenichel/blockly,twodee/blockly,rachel-fenichel/blockly,joshlory/blockly,twodee/blockly,google/blockly,twodee/blockly,picklesrus/blockly