DOC: clarify wording

Co-authored-by: Jody Klymak <[email protected]>

Author: tacaswell

doc/users/project/mission.rst

@@ -3,7 +3,7 @@ Matplotlib Mission Statement
 
 The Matplotlib developer community develops, maintains, and supports Matplotlib
 and its extensions to provide plotting tools for the Scientific Python
-Ecosystem.  Our success is based on how effectively we enable our users, across
+Ecosystem.  We judge our success based on how effectively we enable our users, across
 scientific, industrial, commercial, and educational domains, to achieve their
 goals.
 
@@ -16,9 +16,8 @@ Adapting the requirements :ref:`laid out by John Hunter
 <History>` Matplotlib should:
 
 * Support all users of the Scientific Python Ecosystem;
-* Produce high-quality raster and vector formats output;
-* Be embeddedable in graphical user interfaces for application development,
-  standalone, and on the web.
+* Produce high-quality raster and vector format outputs;
+* Be usable as a stand-alone graphical user interface, and to be embeddable in applications, both native and on the web.
 * Be understandable and extendable by people familiar with data processing
   techniques and with the Python programming language;
 * Make common plots easy;