Remove trailing whitespace

base/docs/basedocs.jl

@@ -23,7 +23,7 @@ as well as many great tutorials and learning resources:
 For help on a specific function or macro, type `?` followed
 by its name, e.g. `?cos`, or `?@time`, and press enter.
 Type `;` to enter shell mode, `]` to enter package mode.
- 
+
 To exit the interactive session, type `CTRL-D` (press the
 Control/`^` key together with the `d` key), or type `exit()`.
 """