removed wrong update

1-1-introduction.md

2-1-installation.md

2-2-sample-data.md

2-3-license.md

3-1-ui-components.md

3-2-open-data.md

3-3-open-layer.md

3-4-control-perspective.md

3-5-control-boundary.md

3-6-action-history.md

4-1-horizontal-scalar-field.md

4-2-vertical-scalar-field.md

4-3-horizontal-vector-field.md

4-4-vertical-vector-field.md

4-5-isosurface.md

4-6-time-series-data.md

5-1-saving-images.md

5-2-multiple-windows.md

5-3-speed-up-repetitions.md

6-1-acknowledgement.md