Fix typos, tightened wording, and increased clarify in docstrings and help string.

[sajcanty80-lab]

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Docs change/refactoring/dependency upgrade

Motivation and Context / Related issue

Reference - #380. Fixes multiple misspellings such as DPOptimzer to DPOptimizer, Deafault to Default, Implicity to Implicitly, and many more. As well as minor grammar cleanups in the surrounding docstrings. I did all this while ensuring I made no functional changes to the code itself.

How Has This Been Tested (if it applies)

N/A

Checklist

• The documentation is up-to-date with the changes I made.
• I have read the CONTRIBUTING document and completed the CLA (see CONTRIBUTING).
• All tests passed, and additional code has been covered with new tests.

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