Indentation made consistent in docs/installation/local.md file fixes (fossasia#7619)

[ashutoshc8101]

Fixes #7619

Short description of what this resolves:

This fixes inconsistent indention in the poetry installation section of file

Checklist

• [Yes ] I have read the Contribution & Best practices Guide and my PR follows them.
• [ Yes] My branch is up-to-date with the Upstream development branch.
• [ Yes] The unit tests pass locally with my changes
• [ Yes] I have added tests that prove my fix is effective or that my feature works
• [ Yes] I have added necessary documentation (if appropriate)

• [ Yes] All the functions created/modified in this PR contain relevant docstrings.

Before:

Now:

[codecov]

Codecov Report

Merging #7620 (b02325a) into development (b141b37) will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           development    #7620   +/-   ##
============================================
  Coverage        67.27%   67.27%           
============================================
  Files              278      278           
  Lines            13973    13973           
============================================
  Hits              9400     9400           
  Misses            4573     4573           

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[ashutoshc8101]

@iamareebjamal Please review.

[iamareebjamal]

Not needed