Remove example from tab-indentation

[charliermarsh]

Summary

I think the example is more confusing than helpful, since there's no visual difference between the tab and space here (even if it rendered properly).

Closes #11460 (comment).

[github-actions]

ruff-ecosystem results

Linter (stable)

ℹ️ ecosystem check encountered linter errors. (no lint changes; 1 project error)

commaai/openpilot (error)

Failed to clone commaai/openpilot: fatal: active `post-checkout` hook found during `git clone`:
	/home/runner/work/ruff/ruff/checkouts/commaai:openpilot/.git/hooks/post-checkout
For security reasons, this is disallowed by default.
If this is intentional and the hook should actually be run, please
run the command again with `GIT_CLONE_PROTECTION_ACTIVE=false`
warning: Clone succeeded, but checkout failed.
You can inspect what was checked out with 'git status'
and retry with 'git restore --source=HEAD :/'

Linter (preview)

✅ ecosystem check detected no linter changes.

Formatter (stable)

ℹ️ ecosystem check encountered format errors. (no format changes; 1 project error)

commaai/openpilot (error)

Failed to commit: Author identity unknown

*** Please tell me who you are.

Run

  git config --global user.email "you@example.com"
  git config --global user.name "Your Name"

to set your account's default identity.
Omit --global to set the identity only in this repository.

fatal: empty ident name (for <runner@fv-az1200-840.e1fplksw42iexmyiu2m33ibpoe.ex.internal.cloudapp.net>) not allowed

Formatter (preview)

ℹ️ ecosystem check encountered format errors. (no format changes; 1 project error)

commaai/openpilot (error)

ruff format --preview

Failed to commit: Author identity unknown

*** Please tell me who you are.

Run

  git config --global user.email "you@example.com"
  git config --global user.name "Your Name"

to set your account's default identity.
Omit --global to set the identity only in this repository.

fatal: empty ident name (for <runner@fv-az1200-840.e1fplksw42iexmyiu2m33ibpoe.ex.internal.cloudapp.net>) not allowed