docs: add back SDK init links under Topics section

[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

The changes in #397 removed the links to the Topics section in the current documentation.

Before

After

Related issue: #n/a

Approach

Add back the links.

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 #400 (fa8bd5c) into main (4909de3) will increase coverage by 0.00%. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #400   +/-   ##
=======================================
  Coverage   89.62%   89.62%           
=======================================
  Files         158      158           
  Lines       15081    15081           
=======================================
+ Hits        13516    13517    +1     
+ Misses       1565     1564    -1     

Impacted Files	Coverage Δ
Sources/ParseSwift/Parse.swift	99.01% <ø> (ø)
Sources/ParseSwift/Types/ParseConfiguration.swift	53.19% <ø> (ø)
Sources/ParseSwift/Objects/ParseObject.swift	87.44% <0.00%> (+0.14%)	:arrow_up:

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