docs: fix image in tutorial

[cbaker6]

New Pull Request Checklist

• [x] I am not disclosing a vulnerability.
• [x] I am creating this PR in reference to an issue.

Issue Description

Wrong image filename in tutorial.

Related issue: #n/a

Approach

Change filename to parse-swift.png.

Image now shows correctly:

TODOs before merging

• [x] Add changes to documentation (guides, repository pages, in-code descriptions)

[parse-github-assistant[bot]]

Thanks for opening this pull request!

• 🎉 We are excited about your hands-on contribution!

[codecov[bot]]

Codecov Report

Merging #327 (373be51) into main (5966a4c) will decrease coverage by 0.03%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #327      +/-   ##
==========================================
- Coverage   85.00%   84.97%   -0.04%     
==========================================
  Files         114      114              
  Lines       12048    12048              
==========================================
- Hits        10242    10238       -4     
- Misses       1806     1810       +4     

Impacted Files	Coverage Δ
Sources/ParseSwift/LiveQuery/ParseLiveQuery.swift	72.92% <0.00%> (-0.30%)	:arrow_down:
Sources/ParseSwift/Objects/ParseUser.swift	82.43% <0.00%> (-0.19%)	:arrow_down:

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