Changed the xlim and the ylabel (From PR #1646)

[Rodot-]

I changed the xlim and y-axis name.
Description

The xlim was changed from 3000 to 9000 to 500 to 9000. The y-axis name was changed from Luminosity to Luminosity Density.
Motivation and context

How has this been tested?

• Testing pipeline.
• Other.

Examples

Type of change

• Bug fix.
• New feature.
• Breaking change.
• None of the above.

Checklist

• My change requires a change to the documentation.
  • I have updated the documentation accordingly.
  • (optional) I have built the documentation on my fork following the instructions.
• I have assigned and requested two reviewers for this pull request.

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[codecov]

Codecov Report

Merging #1711 (9aa610c) into master (60cd602) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1711   +/-   ##
=======================================
  Coverage   61.87%   61.87%           
=======================================
  Files          63       63           
  Lines        5852     5852           
=======================================
  Hits         3621     3621           
  Misses       2231     2231           

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