added tip header for figure formats

Author: tompc35

_episodes/08-putting-it-all-together.md

@@ -317,8 +317,9 @@ fig.savefig("my_plot_name.png")
 ~~~
 {: .language-python}
 
-Which will save the `fig` created using Pandas/matplotlib as a png file with the name `my_plot_name`
+which will save the `fig` created using Pandas/matplotlib as a png file with the name `my_plot_name`
 
+> ## Tip: Saving figures in different formats
 > ~~~
 >     Matplotlib recognizes the extension used in the filename and
 >     supports (on most computers) png, pdf, ps, eps and svg formats.