term: don't use "stage" for .dvc files (in it's guide)

per #1527 (review)

content/docs/user-guide/dvc-files-and-directories.md

@@ -51,13 +51,13 @@ meta:
 
 - `outs` (always present): List of <abbr>output</abbr> entries (details below)
   that represent the files or directories tracked with DVC. Typically there is
-  only one per `.dvc` file (but several can be added or combined manually).
-- `deps`: List of <abbr>dependency</abbr> entries (details below) for this
-  stage, only present when `dvc import` and `dvc import-url` are used. Typically
-  there is only one (but several can be added manually).
-- `wdir` (optional): Working directory for the stage command to run in (relative
-  to the file's location). If this field is not present explicitly, it defaults
-  to `.` (the file's location).
+  only one (but several can be added or combined manually).
+- `deps`: List of <abbr>external dependency</abbr> entries (details below). Only
+  present when `dvc import` and `dvc import-url` are used to generate this
+  `.dvc` file. Typically there is only one (but several can be added manually).
+- `wdir` (optional): Working directory for the `outs` and `deps` paths (relative
+  to the `.dvc` file's location). If this field is not present explicitly, it
+  defaults to `.` (the `.dvc` file's location).
 - `meta` (optional): Arbitrary metadata can be added manually with this field.
   Any YAML contents is supported. `meta` contents are ignored by DVC, but they
   can be meaningful for user processes that read `.dvc` files.