Replace ethnicity with ethnic origin

Author: egircys

contributing/code_of_conduct/index.rst

@@ -7,8 +7,8 @@ Our Pledge
 In the interest of fostering an open and welcoming environment, we as
 contributors and maintainers pledge to making participation in our project and
 our community a harassment-free experience for everyone, regardless of age, body
-size, disability, ethnicity, gender identity and expression, level of experience,
-education, socio-economic status, nationality, personal appearance, ethnic origin,
+size, disability, ethnic origin, gender identity and expression, level of experience,
+education, socio-economic status, nationality, personal appearance,
 religion, or sexual identity and orientation.
 
 Our Standards