follow-up on Python config re-naming

[tomeichlersmith]

Most of the usage documentation should be updated to acknowledge the renames in LDMX-Software/ldmx-sw#1956

I do not want to replace the current camelCase variable names with the updated snake_case variable names. Instead, I would like to add notes (via admonish) warning the user about how the difference between v4.5.X (and earlier) and v4.6.X (and later) is largely a change in style of these names. Hopefully, the above PR will be quickly followed by a resolution for LDMX-Software/ldmx-sw#1303 that would prevent folks from getting more confusing errors by catching these mis-spellings on the Python side.

~~~admonish warning title="Parameter Renames"
v4.6.0 of ldmx-sw marked a change when we switched from `camelCase` style
variable names in the Python configuration modules to `snake_case`.
This change touched nearly all of the configuration classes, so care must be taken
when updating the configuration script.
~~~