* Modify plot_custom_kernel for matplotlib v2 comp
Add `edgecolors` attribute in scatter plot for better visualization
in matplotlib version 2
Issue: #8364
* Modify plot_oneclass.py for matplotlib v2 comp
Add `edgecolors` attribute to scatter plot for better
visualization in matplotlib version 2
Issue: #8364
* Modify plot_rbf_parameters for matplotlib v2
Add `edgecolors` attribute to scatter plot for
better visualization.
Issue: #8364
* Modify plot_separating_hyperplane_unbalanced for matplotlib v2
Add `edgecolors` attribute to scatter plot for better visualization.
Issue: #8364
* Modify plo_svm_kernels for matplotlib v2
Add `edgecolors` attribute to scatter plot for better
visualization.
Issue: #8364
* Modify plot_svm_margin for matplotlib v2 comp
Add `edgecolors` attribute to scatter plot for better
visualization.
Issue: #8364
* Modify plot_svm_nonlinear for matplotlib v2
Add `edgecolors` attribute to scatter plot for matplotlib
version 2 compatibility
Issue: #8364
* Modify file for remove flake8 error
Remove extra white space.
Issue: #8364
The comment in a few example plots refer to "the mesh [x_min, m_max] x
[y_min, y_max]" when it should be "x_max".
Also fixed the spacing in plot_random_forest_embedding.py `[x_min,
x_max] x [y_min, y_max]` to `[x_min, x_max]x[y_min, y_max]` to comply
with the coding style of other files with similar code (like those in
the current pull request).