Fix Tables in aboutus.html

[NtemKenyor]

Describe the bug
As much as HTML is simple, we still make mistakes. LOL. Please check the table in aboutus.html and fix it.

File/Files you will work on
aboutus.html

Possible Lines of Code
You should not add above the possible lines of code. (if given)

Result or Final Looks
The Table opening tags and end tags should be alright. The HTML table should be fixed. Thank you.

[shrutilenka]

Hey @NtemKenyor I am interested to work on this issue.Could you please assign this to me?

[salilbc]

Please review my PR for the fix

[NtemKenyor]

Well done guys.