fix(docs): ls command usage instructions

PR-URL: #3423
Credit: @gurdiga
Close: #3423
Reviewed-by: @ruyadorno

Author: gurdiga

lib/ls.js

@@ -36,7 +36,7 @@ class LS extends ArboristWorkspaceCmd {
 
   /* istanbul ignore next - see test/lib/load-all-commands.js */
   static get usage () {
-    return ['npm ls [[<@scope>/]<pkg> ...]']
+    return ['[[<@scope>/]<pkg> ...]']
   }
 
   /* istanbul ignore next - see test/lib/load-all-commands.js */

tap-snapshots/test/lib/load-all-commands.js.test.cjs

@@ -583,7 +583,7 @@ npm ls
 List installed packages
 
 Usage:
-npm ls npm ls [[<@scope>/]<pkg> ...]
+npm ls [[<@scope>/]<pkg> ...]
 
 Options:
 [-a|--all] [--json] [-l|--long] [-p|--parseable] [-g|--global] [--depth <depth>]

tap-snapshots/test/lib/utils/npm-usage.js.test.cjs

@@ -678,7 +678,7 @@ All commands:
                     List installed packages
                     
                     Usage:
-                    npm ls npm ls [[<@scope>/]<pkg> ...]
+                    npm ls [[<@scope>/]<pkg> ...]
                     
                     Options:
                     [-a|--all] [--json] [-l|--long] [-p|--parseable] [-g|--global] [--depth <depth>]