Fix pr transfer command documentation inconsistency

[Copilot]

Documentation used plural "pull requests" while the command implementation and help text use singular "a pull request".

Change

• docs/src/content/docs/setup/cli.md: Changed description from "Transfer pull requests between repositories." to "Transfer a pull request to another repository."

Context

The command accepts exactly one PR URL (Args: cobra.ExactArgs(1)) and the source code short description is "Transfer a pull request to another repository". Documentation now matches implementation.

Original prompt

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This section details on the original issue you should resolve

<issue_title>[cli-consistency] Minor inconsistency in pr transfer command description</issue_title>
<issue_description>## Issue Description

Command: gh aw pr transfer
Type: Documentation inconsistency with source code
Priority: Low

Current State

In Documentation (docs/src/content/docs/setup/cli.md line 395-402):

##### `pr transfer`

Transfer pull requests between repositories.

In Source Code (pkg/cli/pr_command.go line 59):

Short: "Transfer a pull request to another repository",

Issue

The documentation uses plural "pull requests" while the command's short description uses singular "a pull request".

The command implementation confirms it only transfers ONE pull request at a time:

• Command definition: Args: cobra.ExactArgs(1) (line 76 of pkg/cli/pr_command.go)
• Usage: Use: "transfer PULL-REQUEST-URL" (line 58)

Suggested Fix

Update documentation to match the source code's singular form for technical accuracy:

##### `pr transfer`

Transfer a pull request to another repository.

Context

This was discovered during CLI consistency analysis. The singular form is more accurate since the command only accepts a single PR URL as an argument.

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Note: This analysis was conducted through source code review. Verification against actual CLI --help output is recommended.

AI generated by CLI Consistency Checker</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [cli-consistency] Minor inconsistency in pr transfer command description #4279

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[Copilot]

Pull Request Overview

This PR fixes a documentation inconsistency where the pr transfer command description used plural "pull requests" when the command implementation only accepts a single PR URL. The documentation now correctly states "Transfer a pull request to another repository" to match the source code's singular form.

• Updated documentation to use singular form "a pull request" instead of plural "pull requests"

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