fix(prefix): remove duplicate -g from usage output (#7944)

Author: wraithgar

lib/commands/prefix.js

@@ -5,7 +5,6 @@ class Prefix extends BaseCommand {
   static description = 'Display prefix'
   static name = 'prefix'
   static params = ['global']
-  static usage = ['[-g]']
 
   async exec () {
     return output.standard(this.npm.prefix)

tap-snapshots/test/lib/docs.js.test.cjs

@@ -3754,15 +3754,15 @@ exports[`test/lib/docs.js TAP usage prefix > must match snapshot 1`] = `
 Display prefix
 
 Usage:
-npm prefix [-g]
+npm prefix
 
 Options:
 [-g|--global]
 
 Run "npm help prefix" for more info
 
 \`\`\`bash
-npm prefix [-g]
+npm prefix
 \`\`\`
 
 Note: This command is unaware of workspaces.