Confidence level docstring for minos

[alexander-held]

The docstring for cl in minos is

cl (float or None, optional) – Confidence level of the interval. If not set or None, a standard 68 % interval is computed (default). [...]

which to me sounds like it would by default compute a 68.00% confidence interval. It does however also say "standard" which might have different meanings to different people. The current behavior is that the default is equivalent to cl=1, corresponding to a 68.27% interval instead.

I propose to change the docstring to "68.27 %" to clarify this, happy to submit a PR if useful.

[HDembinski]

If you feel strongly about that, feel free to submit a PR. Perhaps a more precise wording would be

..., a standard interval is computed (default). A standard interval has about 68.3 % confidence, analog to being within one standard deviation around the mean of a normal distribution.

The word about should make clear that this is an approximate number and the exact value is derived from the normal distribution.