normalize [dir] to [DIR]

internal/command/providers.go

@@ -149,7 +149,7 @@ func (c *ProvidersCommand) populateTreeNode(tree treeprint.Tree, node *configs.M
 }
 
 const providersCommandHelp = `
-Usage: terraform [global options] providers [dir]
+Usage: terraform [global options] providers [DIR]
 
   Prints out a tree of modules in the referenced configuration annotated with
   their provider requirements.

website/docs/cli/commands/0.12upgrade.mdx

@@ -15,7 +15,7 @@ with Terraform v0.12.
 
 ## Usage
 
-Usage: `terraform 0.12upgrade [options] [dir]`
+Usage: `terraform 0.12upgrade [options] [DIR]`
 
 By default, `0.12upgrade` changes configuration files in the current working
 directory. However, you can provide an explicit path to another directory if

website/docs/cli/commands/0.13upgrade.mdx

@@ -15,7 +15,7 @@ provider source settings are stored in a `required_providers` block.
 
 ## Usage
 
-Usage: `terraform 0.13upgrade [options] [dir]`
+Usage: `terraform 0.13upgrade [options] [DIR]`
 
 The primary purpose of the `0.13upgrade` command is to determine which
 providers are in use for a module, detect the source address for those