Document project-specific command root generation function

The function that creates the Cobra CLI command root is declared by each project, and so might have any name. The
"docsgen" program that generates the command line reference content for the website calls this function, so it will be
necessary for the appropriate function to be added to the program when it is added to a project.

Previously, there was no documentation of this project-specific component of the "template", which could result in
confusion when it was applied to a project that happens to have a different function name from the `cli.NewCommand()`
used by the "template" docsgen code.

Author: per1234

workflow-templates/assets/cobra/docsgen/main.go

@@ -31,6 +31,7 @@ func main() {
 
 	os.MkdirAll(os.Args[1], 0755) // Create the output folder if it doesn't already exist
 
+	// TODO: Replace `cli.NewCommand()` with the project's Cobra CLI package function for command root
 	cli := cli.NewCommand()
 	cli.DisableAutoGenTag = true // Disable addition of auto-generated date stamp
 	err := doc.GenMarkdownTree(cli, os.Args[1])

workflow-templates/deploy-cobra-mkdocs-versioned-poetry.md

@@ -45,7 +45,9 @@ If there are any additional documentation generation tasks, add them to the `doc
 #### `docsgen`
 
 - [`go.mod`](assets/cobra/docsgen/go.mod) - replace `MODULE_NAME` with the project's module name.
-- [`main.go`](assets/cobra/docsgen/main.go) - replace `CLI_PACKAGE_NAME` with the project's Cobra CLI package name
+- [`main.go`](assets/cobra/docsgen/main.go)
+  - replace `CLI_PACKAGE_NAME` with the project's Cobra CLI package name
+  - replace `cli.NewCommand()` with the project's Cobra CLI package function for [command root](https://github.com/spf13/cobra/blob/master/user_guide.md#create-rootcmd) generation
 
 Run the following command from the `docsgen/` folder: