Minor improve for references in README
# Intel(R) Extension for Scikit-learn*
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+[Installation](https://github.com/intel/scikit-learn-intelex#-installation)&nbsp;&nbsp;&nbsp;|&nbsp;&nbsp;&nbsp;[Documentation](https://intel.github.io/scikit-learn-intelex/)&nbsp;&nbsp;&nbsp;|&nbsp;&nbsp;&nbsp;[Notebook examples](https://github.com/intel/scikit-learn-intelex/tree/master/examples/notebooks)&nbsp;&nbsp;&nbsp;|&nbsp;&nbsp;&nbsp;[Medium blogs](https://medium.com/intel-analytics-software/tagged/machine-learning)&nbsp;&nbsp;&nbsp;|&nbsp;&nbsp;&nbsp;[Get Started](https://github.com/intel/scikit-learn-intelex#%EF%B8%8F-get-started)&nbsp;&nbsp;&nbsp;|&nbsp;&nbsp;&nbsp;[Support](https://github.com/intel/scikit-learn-intelex#-support)&nbsp;&nbsp;&nbsp;
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