Add a more welcoming tone for new contributors

doc/README.rst

@@ -3,16 +3,13 @@
 Contributing to the documentation
 =================================
 
-If you're not the developer type, contributing to the documentation is still
-of huge value. You don't even have to be an expert on
-*pandas* to do so! Something as simple as rewriting small passages for clarity
-as you reference the docs is a simple but effective way to contribute. The
-next person to read that passage will be in your debt!
-
-Actually, there are sections of the docs that are worse off by being written
-by experts. If something in the docs doesn't make sense to you, updating the
-relevant section after you figure it out is a simple way to ensure it will
-help the next person.
+Whether you are someone who loves writing, teaching, or development, 
+contributing to the documentation is a huge value. While some familiarity
+with **pandas** is helpful, we don't expect you to be an expert to
+contribute documentation. In fact, new users of **pandas** can provide
+helpful improvements and clarify things that are confusing to them. By
+improving the documentation even a small bit, you will be helping the
+next person while gaining experience yourself.
 
 .. contents:: Table of contents:
  :local: