function_graph_all: Create a graph that describes network of package functions
In rich-iannone/pkgattrs: Generate Information Summaries on R Packages

Create a DiagrammeR graph that contains nodes of the type function and edges that have the relationship called_in.

1	function_graph_all(pkgattrs_tbl, pkg_name = NULL)

`pkgattrs_tbl`	A tibble object that contains package function information. This is created by the `pkgattrs()` function.
`pkg_name`	An optional package name for filtering the tibble provided to `pkgattrs_tbl`, which is useful if that tibble describes multiple packages.