solvers/recurr: Correctly indent docstring of rsolve_ratio
solvers/recurr: Correctly indent docstring of rsolve_ratio

The Examples subsection of the docstring of rsolve_ratio was unindented
compared to the rest of the docstring; this caused Sphinx to throw a
warning and the section wasn't displayed in the generated docs. Indent
it inline with the rest of the docstring to fix this.

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