cmd/cue: point "help get" text at CUE-specific cmd

This updates the "cue help get" text to make it clear that "cue get"
doesn't interact with CUE dependencies. For CUE modules, it updates two
help texts by pointing the reader onwards to "cue help modules", and
from there to "cue help mod".

Also: fix a typo (which was the initial motivation for this edit)

Signed-off-by: Jonathan Matthews <[email protected]>
Change-Id: I2a980be042fe544c95a71c8b46a20616cb7c4bd6
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/1198447
TryBot-Result: CUEcueckoo <[email protected]>
Reviewed-by: Daniel Martí <[email protected]>

cmd/cue/cmd/get.go

@@ -23,16 +23,19 @@ import (
 func newGetCmd(c *Command) *cobra.Command {
 	cmd := &cobra.Command{
 		Use:   "get <language> [packages]",
-		Short: "add dependencies to the current module",
-		Long: `Get downloads packages or modules for CUE or another language
+		Short: "add non-CUE dependencies to the current module",
+		Long: `Get downloads packages or modules for non-CUE languages
 to include them in the module's pkg directory.
 
 Get requires an additional language field to determine for which
-language definitions should be fetched. If get fetches definitions
-for a language other than CUE, the definitions are extracted from
-the source of the respective language and stored.
-The specifics on how dependencies are fechted and converted vary
+language definitions should be fetched. Definitions are extracted
+from the source of the respective language and stored.
+The specifics on how dependencies are fetched and converted vary
 per language and are documented in the respective subcommands.
+
+For information on native CUE modules:
+
+    cue help modules
 `,
 		RunE: mkRunE(c, func(cmd *Command, args []string) error {
 			stderr := cmd.Stderr()

cmd/cue/cmd/help.go

@@ -286,6 +286,10 @@ For a detailed reference on modules:
 
 	https://cuelang.org/docs/reference/modules/
 
+For information on commands that interact with modules:
+
+    cue help mod
+
 For tutorials on how to use the Central Registry, see:
 
 	https://cuelang.org/docs/tutorial/working-with-the-central-registry/

cmd/cue/cmd/testdata/script/help.txtar

@@ -86,7 +86,7 @@ Available Commands:
   export         output data in a standard format
   fix            rewrite packages to latest standards
   fmt            formats CUE configuration files
-  get            add dependencies to the current module
+  get            add non-CUE dependencies to the current module
   help           show help text for a command or topic
   import         convert other formats to CUE files
   login          log into a CUE registry