Update spelling/ Grammar errors

[jordynmackool]

Fixes #2021

Risk

This PR makes no API changes.

Testing Plan

• I have verified that I have not introduced new warnings in this PR (or explain why below) - N/A; No testing is needed as this PR fixes spelling and grammar updates only.
• I have run the unit tests with this PR - N/A; No testing is needed as this PR fixes spelling and grammar updates only.
• I have tested this PR against Core and verified behavior (if applicable, if not applicable, explain why below). - N/A; No testing is needed as this PR fixes spelling and grammar updates only.*

Unit Tests

[Describe the unit tests and behaviors added in this PR] - N/A; No unit testing is needed as this PR fixes spelling and grammar updates only.

Core Tests

N/A; No testing is needed as this PR fixes spelling and grammar updates only.

Summary

Fixes existing spelling/ grammar errors in the iOS Documentation.

Changelog

Breaking Changes

• N/A

Enhancements

• N/A

Bug Fixes

• Fixes Spelling/ Grammar Updates #2021

Tasks Remaining:

N/A

CLA

• I have signed the CLA

[codecov]

Codecov Report

Merging #2022 (5ad5996) into develop (1f7510c) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #2022      +/-   ##
===========================================
- Coverage    85.11%   85.08%   -0.03%     
===========================================
  Files          441      441              
  Lines        22588    22571      -17     
===========================================
- Hits         19225    19204      -21     
- Misses        3363     3367       +4