Fix description of line_overlap

[fl4p]

Pull request

Fix the description of the line_overlap in LAParams. A smaller line_overlap means the aggregator will merge words with a smaller overlap of bboxs. The current writing would be correct if it referred to line_offset.

How Has This Been Tested?

Decrease the value of line_overlap will produce less lines.

Checklist

• I have read CONTRIBUTING.md.
• [na?] I have added a concise human-readable description of the change to CHANGELOG.md.
• I have tested that this fix is effective or that this feature works.
• I have added docstrings to newly created methods and classes.
• I have updated the README.md and the readthedocs documentation. Or verified that this is not necessary.