DOC : Fix misrendered docstrings in IncrementalLinearRegression

[david-cortes-intel]

Description

This PR fixes some misrendered docstrings:
git push --set-upstream origin fix_inclinreg_docstrings

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Flag	Coverage Δ
github	83.20% <ø> (ø)

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Files with missing lines	Coverage Δ
sklearnex/linear_model/incremental_linear.py	82.73% <ø> (ø)