Fix a typo.  Improve the documentation.
@@ -210,7 +210,7 @@ kgtk cat -i examples/docs/movies_reduced.tsv
| t17 | terminator | award | national_film_registry |
| t18 | t17 | point_in_time | ^2008-01-01T00:00:00Z/9 |
-Suppose that `tutorial_people_fill.tsv` contains the following table in KGTK format:
+Suppose that `tutorial_people_full.tsv` contains the following table in KGTK format:
```bash
kgtk cat -i examples/docs/tutorial_people_full.tsv
@@ -244,10 +244,11 @@ kgtk cat -i examples/docs/tutorial_people_full.tsv
### Combine two KGTK files, sending the output to standard output.
+These two files have only he 4 basic KGTK fields.
+
```bash
kgtk cat -i examples/docs/movies_reduced.tsv examples/docs/tutorial_people_full.tsv
```
-
The result will be the following file in KGTK format:
| id | node1 | label | node2 |
