[docs] fix documents

[joshiayush]

• fix spelling mistakes
• fix missing letters
• fix missing words
• fix grammar mistakes
• fix tenses
• fix table styling
• fix newline breaks
• fix quotes

[ignore] ignore vscode configuration files and python's ubuntu virtual environment

• ignore python's virtualenv files and directories
• ignore python virtual environment configuration file
• ignore vscode configuration files

@Sispheor Please review my changes.

[joshiayush]

@Sispheor Thanks for your response. I understand the problem with this PR. In my next PR I'll only fix the following mistakes:

• spelling
• letters
• words
• grammar
• tenses