Update CONTRIBUTING.md

Author: DanielGoldfarb

CONTRIBUTING.md

@@ -5,5 +5,5 @@ so we will mention here just a few items here for which we may be particular in
 
 - Coding:
   - If you write code, please don't use tabs, rather use spaces.
-  - If you add a significant feature, that is a feature for which explaining its usage takes more than just a sentence or two, please also create a "tutorial notebook" for that feature.  For example, see the jupyter notebooks in the examples folder: https://github.com/matplotlib/mplfinance/tree/master/examples
+  - If you add a significant feature, that is a feature for which explaining its usage takes more than just a sentence or two, please also create a "tutorial notebook" for that feature.  For examples of tutorial notebooks, please see the jupyter notebooks in the examples folder: https://github.com/matplotlib/mplfinance/tree/master/examples
   - If you add a significant feature, please also create a regression test file in the tests folder, https://github.com/matplotlib/mplfinance/tree/master/tests, similar to the other regression tests that are there.  *Often, the simplest way to do this is to take a few of the examples from the feature's "tutorial notebook"* (see previous point).