[cli] Add --git-branch to pull command help output (#10382)

Improves the help for pull command by adding --git-branch to the output.

packages/cli/src/commands/pull/command.ts

@@ -22,6 +22,16 @@ export const pullCommand: Command = {
       deprecated: false,
       multi: false,
     },
+    {
+      name: 'git-branch',
+      description:
+        'Specify the Git branch to pull specific Environment Variables for',
+      argument: 'branch',
+      shorthand: null,
+      type: 'string',
+      deprecated: false,
+      multi: false,
+    },
     {
       name: 'yes',
       description:
@@ -45,6 +55,10 @@ export const pullCommand: Command = {
       name: 'Pull for a specific environment',
       value: `${packageName} pull --environment=${getEnvTargetPlaceholder()}`,
     },
+    {
+      name: 'Pull for a preview feature branch',
+      value: `${packageName} pull --environment=preview --git-branch=feature-branch`,
+    },
     {
       name: 'If you want to download environment variables to a specific file, use `vercel env pull` instead',
       value: `${packageName} env pull`,