Fix x_demonimator → x_denominator typo in lamberts_ellipsoidal_distance.py

[ManVT26]

Fixes typo breaking the denominator calculation.

Changes:

• Line 85: x_demonimator → x_denominator

Verification:

• Doctests should now pass
• Commit email: 21f2000858@ds.study.iitm.ac.in ✓

Closes #11308 (if exists)

[algorithms-keeper]

Closing this pull request as invalid

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