Improve Figure.shift_origin docstring
@@ -395,9 +395,9 @@ class Figure:
"""
Shift plot origin in x and/or y directions.
- This method shifts plot origin relative to the current origin by
- (*xshift*, *yshift*) and optionally append the length unit (**c**,
- **i**, or **p**).
+ This method shifts the plot origin relative to the current origin
+ by (*xshift*, *yshift*). Optionally, append the length unit (**c**,
+ **i**, or **p**). Default unit if not given is **c** for centimeter.
Prepend **a** to shift the origin back to the original position after
plotting, prepend **c** to center the plot on the center of the paper
