docs/configuration: specify order of precedence (#6638)
docs/configuration: specify order of precedence (#6638)

This updates the docs to show the search order of the config files.

Order comes from: https://github.com/prettier/prettier/blob/3805034bdfe45722e31a1abf019d4368dfb8ae11/src/config/resolve-config.js#L35-L44
rattrayalex/prettier,prettier/prettier,prettier/prettier,jlongster/prettier,prettier/prettier,rattrayalex/prettier,rattrayalex/prettier,prettier/prettier