Moved peer review section for any pull request to the top so it applies to all sections, changed wording based on Rohit's comments

Author: DavidJVitale

CONTRIBUTING.md

@@ -1,4 +1,4 @@
-Esri welcomes contributions from anyone and everyone. Please see our [guidelines for contributing](https://github.com/esri/contributing).
+Esri welcomes contributions from anyone and everyone. Please see our [guidelines for contributing](https://github.com/esri/contributing). Please expect any pull request to go through a peer review before being accepted.
 
 ### Before filing an issue
 
@@ -23,7 +23,8 @@ Do you see an error in an existing notebook? Is there a typo, a misnamed variabl
 
 # Adding new sample notebooks
 
-Do you have a notebook that shows off functionality of the API? Do you want to see that notebook released with the next version of the ArcGIS API for Python? We welcome your notebooks and workflows as it will benefit a large audience. Please expect your pull request to go through a proper a peer review before being accepted.
+Do you have a notebook that shows off functionality of the API? Do you want to see that notebook released with the next version of the ArcGIS API for Python? We welcome your notebooks and workflows as it will benefit a large audience.
+
 * Create a new notebook, make sure it runs consistently on its own on a few systems
     * Make sure the notebook filename is in an `all_lowercase_underscore_delimiter_convention.ipynb`
 * Make a copy of the `dev_site_next_release` branch on your local fork