Modernize Arcanist documentation

Summary: Change `project_id` to `project.name` and `conduit_uri` to `phabricator.uri`.

Test Plan: `grep`

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D9736

src/docs/user/configuration/advanced_configuration.diviner

@@ -25,7 +25,7 @@ to lowest priority:
     running `bin/config`.
   - **Config Files**: Values are stored in a config file in `conf/`. The file
     to use is selected by writing to `conf/local/ENVIRONMENT`, or setting the
-    PHABRICATOR_ENV configuration variable. See below for more information.
+    `PHABRICATOR_ENV` configuration variable. See below for more information.
   - **Defaults**: Defaults hard-coded in the Phabricator source, which can not
     be edited. They have the lowest priority, and all other settings override
     them.