Bring the example congfiguration file in line with the documentation.

[Szauka]

Requirements

• Update examples to follow the documentation. https://mochajs.org/#configuring-mocha-nodejs
• The example configuration files aren't named correctly what could lead to confusion.

Description of the Change

Renamed the example configuration files.

Benefits

Avoid confusion.

[jsf-clabot]

All committers have signed the CLA.

[coveralls]

Coverage increased (+0.03%) to 91.757% when pulling a6d4cc6 on Szauka:Szauka-patch-1 into 42303e2 on mochajs:master.

[boneskull]

works for me, thanks!

[paulmelnikow]

Thanks for this @Szauka! I was totally confused by this the first time around. (badges/shields#3065)