Update links to CLI docs in code comments, messages, and readme

README.md

@@ -36,7 +36,7 @@ Show off your Terraform knowledge by passing a certification exam. Visit the [ce
 Developing Terraform
 --------------------
 
-This repository contains only Terraform core, which includes the command line interface and the main graph engine. Providers are implemented as plugins that each have their own repository in [the `terraform-providers` organization](https://github.com/terraform-providers) on GitHub. Instructions for developing each provider are in the associated README file. For more information, see [the provider development overview](https://www.terraform.io/docs/plugins/provider.html).
+This repository contains only Terraform core, which includes the command line interface and the main graph engine. Providers are implemented as plugins, and Terraform can automatically download providers that are published on [the Terraform Registry](https://registry.terraform.io). HashiCorp develops some providers, and others are developed by other organizations. For more information, see [Extending Terraform](https://www.terraform.io/docs/extend/index.html).
 
 To learn more about compiling Terraform and contributing suggested changes, please refer to [the contributing guide](.github/CONTRIBUTING.md).
 

command/import.go

@@ -343,7 +343,7 @@ func (c *ImportCommand) Synopsis() string {
 }
 
 const importCommandInvalidAddressReference = `For information on valid syntax, see:
-https://www.terraform.io/docs/internals/resource-addressing.html`
+https://www.terraform.io/docs/cli/state/resource-addressing.html`
 
 const importCommandMissingResourceFmt = `[reset][bold][red]Error:[reset][bold] resource address %q does not exist in the configuration.[reset]
 

command/init.go

@@ -714,7 +714,7 @@ func (c *InitCommand) getProviders(config *configs.Config, state *states.State,
 			if thirdPartySigned {
 				c.Ui.Info(fmt.Sprintf("\nPartner and community providers are signed by their developers.\n" +
 					"If you'd like to know more about provider signing, you can read about it here:\n" +
-					"https://www.terraform.io/docs/plugins/signing.html"))
+					"https://www.terraform.io/docs/cli/plugins/signing.html"))
 			}
 		},
 		HashPackageFailure: func(provider addrs.Provider, version getproviders.Version, err error) {

commands.go

@@ -103,7 +103,7 @@ func initCommands(
 
 	// The command list is included in the terraform -help
 	// output, which is in turn included in the docs at
-	// website/docs/commands/index.html.markdown; if you
+	// website/docs/cli/commands/index.html.markdown; if you
 	// add, remove or reclassify commands then consider updating
 	// that to match.
 

docs/README.md

@@ -4,7 +4,7 @@ This directory contains some documentation about the Terraform Core codebase,
 aimed at readers who are interested in making code contributions.
 
 If you're looking for information on _using_ Terraform, please instead refer
-to [the main Terraform CLI documentation](https://www.terraform.io/docs/cli-index.html).
+to [the main Terraform CLI documentation](https://www.terraform.io/docs/cli/index.html).
 
 ## Terraform Core Architecture Documents
 

help.go

@@ -41,7 +41,7 @@ func helpFunc(commands map[string]cli.CommandFactory) string {
 	sort.Strings(otherCommands)
 
 	// The output produced by this is included in the docs at
-	// website/source/docs/commands/index.html.markdown; if you
+	// website/source/docs/cli/commands/index.html.markdown; if you
 	// change this then consider updating that to match.
 	helpText := fmt.Sprintf(`
 Usage: terraform [global options] <subcommand> [args]

internal/legacy/terraform/resource_address.go

@@ -92,7 +92,7 @@ func (r *ResourceAddress) String() string {
 
 // HasResourceSpec returns true if the address has a resource spec, as
 // defined in the documentation:
-//    https://www.terraform.io/docs/internals/resource-addressing.html
+//    https://www.terraform.io/docs/cli/state/resource-addressing.html
 // In particular, this returns false if the address contains only
 // a module path, thus addressing the entire module.
 func (r *ResourceAddress) HasResourceSpec() bool {