fix(docs): line space between image and line

[Jocs]

close https://github.com/dream-num/univer-pro/issues/1782 and https://github.com/dream-num/univer-pro/issues/1777

Pull Request Checklist

• Related tickets or issues have been linked in the PR description (or missing issue).
• Naming convention is followed (do please check it especially when you created new plugins, commands and resources).
• Unit tests have been added for the changes (if applicable).
• Breaking changes have been documented (or no breaking changes introduced in this PR).

[github-actions]

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 31 lines in your changes missing coverage. Please review.

Project coverage is 27.44%. Comparing base (9697d87) to head (0c56751).
Report is 4 commits behind head on dev.

Files	Patch %	Lines
...onents/docs/layout/block/paragraph/layout-ruler.ts	0.00%	14 Missing ⚠️
...ages/engine-render/src/components/docs/document.ts	0.00%	6 Missing ⚠️
...gine-render/src/components/docs/extensions/line.ts	0.00%	5 Missing ⚠️
...ckages/engine-render/src/components/docs/liquid.ts	0.00%	4 Missing ⚠️
...mponents/docs/text-selection/convert-text-range.ts	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #3101      +/-   ##
==========================================
+ Coverage   27.43%   27.44%   +0.01%     
==========================================
  Files        1980     1980              
  Lines      104895   104893       -2     
  Branches    22644    22644              
==========================================
+ Hits        28777    28787      +10     
+ Misses      76118    76106      -12     

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