fixed grammer as per grammerly suggestions

[arghyaiitb]

Closes #97

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:

• Made modification in the .md files as suggested by grammerly.com

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1 out of 2 committers have signed the CLA.

✅ arghyaiitb
❌ Arghya Saha

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[codecov]

Codecov Report

Merging #98 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #98   +/-   ##
=======================================
  Coverage   91.61%   91.61%           
=======================================
  Files           6        6           
  Lines         298      298           
=======================================
  Hits          273      273           
  Misses         25       25

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