docs: ran grammarly checks through all the *.md docs

[aquibbaig]

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:

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[aquibbaig]

why am I getting an error log in my Travis build for jdk and jre that no environment variables are set?

[thinkingserious]

Hello @aquibbaig,

Thanks again for the PR!

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[thinkingserious]

Hello @aquibbaig,

Thanks again for the PR!

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[thinkingserious]

Hello @aquibbaig,

Thanks again for the PR!

You have earned 3 out of the 5 points needed to receive glorious SendGrid Hacktoberfest swag.

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Also, please be sure you have officially registered with us here by November 1, 2018 to qualify.

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