docs: improve organization of SDK config

[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

Methods and properties to configure the SDK are scattered throughout the docs.

Related issue: #n/a

Approach

Place all of the methods and properties related to SDK configuration in one section.

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 #409 (d8f9172) into main (62553bc) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #409   +/-   ##
=======================================
  Coverage   89.99%   89.99%           
=======================================
  Files         158      158           
  Lines       15266    15269    +3     
=======================================
+ Hits        13739    13742    +3     
  Misses       1527     1527           

Impacted Files	Coverage Δ
Sources/ParseSwift/Types/ParseOperation.swift	100.00% <ø> (ø)
Sources/ParseSwift/Types/QueryConstraint.swift	98.59% <100.00%> (+0.01%)	:arrow_up:

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