Geometric tilt readme fix

[RowanTL]

Describe your changes

The cargo run command inside of the geometric_tilt example was incorrect. This PR fixes that line.

Issue ticket number and link

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• I have signed the DCO?
• All tests are passing when running make test?
• No errors or security vulnerabilities are reported by make check?

For details on make, please see BUILD.md

Note: The CI runs all of the above and fixing things before they hit CI speeds
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Summary by cubic

Fixes the run command in the geometric_tilt example README so the example runs correctly. Also adds RowanTL to MAINTAINERS.md.

• Bug Fixes
  • Updated README command to: cargo run -p physics_examples --example geometric_tilt

^{Written for commit 3adda72. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 2 files

_{Re-trigger cubic}

[marvin-hansen]

LGTM.