docs: remove grep from pull rate limit prerequisites

[dvdksn]

Summary

• Removes grep from the prerequisite list in the "View pull rate and limit" section of content/manuals/docker-hub/usage/pulls.md
• The three commands shown in that section only use curl and jq — grep is never referenced
• Fixes a factual error that would cause unnecessary confusion for readers checking whether they have the required tools

Closes #24436

🤖 Generated with Claude Code

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[docker-agent]

Assessment: 🟢 APPROVE

This PR correctly removes grep from the prerequisites list. The three commands shown in the "View pull rate and limit" section only use curl and jq:

1. Getting a token anonymously: curl ... | jq -r .token
2. Getting a token with authentication: curl --user ... | jq -r .token
3. Getting headers: curl --head -H "Authorization: Bearer $TOKEN" ...

The grep prerequisite was indeed incorrect and would have confused readers checking whether they have the required tools.

The diff also includes beneficial formatting improvements:

• Table alignment consistency
• List indentation fixes
• Whitespace cleanup

No issues found.