Fixed typo
Fixed typo

The name in tensorboard/README.md of Scalar Dashboard is not
consistent with the actual name: Event Dashboard. So make it
right.

qiuminxu/tensorboard,francoisluus/tensorboard-supervise,ioeric/tensorboard,francoisluus/tensorboard-supervise,tensorflow/tensorboard,agrubb/tensorboard,qiuminxu/tensorboard,shakedel/tensorboard,qiuminxu/tensorboard,shakedel/tensorboard,francoisluus/tensorboard-supervise,tensorflow/tensorboard,ioeric/tensorboard,tensorflow/tensorboard,ioeric/tensorboard,agrubb/tensorboard,tensorflow/tensorboard,qiuminxu/tensorboard,shakedel/tensorboard,ioeric/tensorboard,tensorflow/tensorboard,agrubb/tensorboard,shakedel/tensorboard,agrubb/tensorboard,agrubb/tensorboard,ioeric/tensorboard,qiuminxu/tensorboard,ioeric/tensorboard,qiuminxu/tensorboard,francoisluus/tensorboard-supervise,shakedel/tensorboard,tensorflow/tensorboard,francoisluus/tensorboard-supervise,francoisluus/tensorboard-supervise,shakedel/tensorboard,agrubb/tensorboard,tensorflow/tensorboard