docs: Corrected *.md files using Grammarly

[pushkyn]

Fixes #83

Checklist

• I have made a material change to the repo (functionality, testing, spelling, grammar)
• I have read the [Contribution Guide] and my PR follows them.
• I updated my branch with the master branch.
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation about the functionality in the appropriate .md file
• I have added in line documentation to the code I modified

Short description of what this PR does:

• Corrected *.md files using Grammarly

If you have questions, please send an email to Sendgrid, or file a Github Issue in this repository.

[thinkingserious]

Hello @pushkyn,

Thanks again for the PR!

It's HACKTOBERFEST! We want to show our appreciation by sending you some special Hacktoberfest swag. If you have not already, could you please fill out this form so we can send it to you? Thanks!

Team SendGrid DX

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@e5a728f). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master      #84   +/-   ##
=========================================
  Coverage          ?   95.01%           
=========================================
  Files             ?        2           
  Lines             ?      281           
  Branches          ?        0           
=========================================
  Hits              ?      267           
  Misses            ?       14           
  Partials          ?        0

Impacted Files	Coverage Δ
test/test_ruby_http_client.rb	97.43% <100%> (ø)
lib/ruby_http_client.rb	89.53% <100%> (ø)

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[thinkingserious]

Hello @pushkyn,

Thanks again for the PR!

We appreciate your contribution and look forward to continued collaboration. Thanks!

Team SendGrid DX