Adjust value for radius since it changed in 994cd0c

Make radius a float between 0.05 and 0.95 to which it has been defined in 994cd0c. Apparently this part of the documentation has not been updated.

docs/source/starshot_docs.rst

@@ -61,7 +61,7 @@ A typical analysis sequence looks like so:
 * **Analyze the image** -- After loading the image, all that needs to be done is analyze the image. You may optionally
   pass in some settings::
 
-    mystar.analyze(radius=50, tolerance=0.8) # see API docs for more parameter info
+    mystar.analyze(radius=0.5, tolerance=0.8) # see API docs for more parameter info
 
 * **View the results** -- Starshot can print out the summary of results to the console as well as draw a matplotlib image to show the
   detected radiation lines and wobble circle::