Describe your change:

This PR extends the standard version of the power iteration to handle complex Hermitian input matrices. The only algorithmic change for complex-valued matrices is that the (simplified) Rayleigh Quotient for finding the eigenvalue needs to use the conjugate transpose (x^H M x) rather than the regular transpose (x^T M x).

I also fixed a typo in the documentation ("eignevalue" -> "eigenvalue").

• Add an algorithm?
• [] Fix a bug or typo in an existing algorithm?
• Documentation change?

Checklist:

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized.
• I know that pull requests will not be merged if they fail the automated tests.
• This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
• All new Python files are placed inside an existing directory.
• All filenames are in all lowercase characters with no spaces or dashes.
• All functions and variable names follow Python naming conventions.
• All function parameters and return values are annotated with Python type hints.
• All functions have doctests that pass the automated testing.
• All new algorithms have a URL in its comments that points to Wikipedia or other similar explanation.
• If this pull request resolves one or more open issues then the commit message contains Fixes: #{$ISSUE_NO}.