Typos

[hdevalke]

While reading the guide I found some typos in src/intro/introduction.md:

You should be [-table-]{+able+} to find the output under images directory...

There's an interactive tutorial with Jupyter notebook + excvr [-availible,-]{+available,+} feel ...

Currently Plotters is actively maintained and [-envolving-]{+evolving+} very fast. Any [-involement,-]{+involvement,+}
including PR, suggestion...