Refer to dependency injection in sim function docstrings
Add to dependency injection section of docs
Revise sim docs and docstrings for variable expressions

Thanks to @jiffyclub for comments and suggestions.
Update SeriesWrapper docstring in simulation framework
Name of decorated sim functions default to function name

Use the function name for tables, table sources, columns, and
injectables in decorated functions if no name is provided.
Add tests for decorated sim function defaults
Update docs for decorated sim function defaults
Expand section on accessing columns in tables

[ci-skip]