ref: update repro --pull

per #2242 (review)

content/docs/command-reference/repro.md

@@ -179,10 +179,11 @@ up-to-date and only execute the final stage.
   corresponding pipelines, including the target stages themselves. This option
   has no effect if `targets` are not provided.
 
-- `--pull` - downloads dependencies and outputs in the stages being reproduced
-  from the [default remote storage](/doc/command-reference/remote/default) (see
-  `dvc pull`) based on the run-cache. Note that this doesn't include initial
-  pipeline data sources (never found in the run-cache).
+- `--pull` - attempts to download outputs of stages found in the
+  [run-cache](/doc/user-guide/project-structure/internal-files#run-cache) during
+  reproduction. Uses the
+  [default remote storage](/doc/command-reference/remote/default). See also
+  `dvc pull`
 
 - `-h`, `--help` - prints the usage/help message, and exit.