[DOCS] macOS compatibility

Documentation Type

Incorrect/outdated documentation

Documentation Location

https://code.claude.com/docs/en/setup

Section/Topic

Set up Claude Code

Current Documentation

The docs currently say: "Operating Systems: macOS 10.15+"

What's Wrong or Missing?

However, I'm unable to install on my machine running 11.7.10.

❯ curl -fsSL https://claude.ai/install.sh | bash
Setting up Claude Code...
dyld: Symbol not found: _ubrk_clone
  Referenced from: /Users/francisbehnen/.claude/downloads/claude-2.1.7-darwin-x64 (which was built for Mac OS X 13.0)
  Expected in: /usr/lib/libicucore.A.dylib

bash: line 142: 16445 Abort trap: 6              "$binary_path" install ${TARGET:+"$TARGET"}

Suggested Improvement

The documentation should include how to install CC for pre-13.0 systems.

Impact

High - Prevents users from using the product

Additional Context

_No response_