Add the text "Two backslash characters (//) are used to _comment_ the code, for better understandability. Anything after // on a line is ignored while compiling the program" to help new users understand commenting.
* new information regarding hello world
## Extra
* you know the first ever program you write was hello world program whether it be in any language.
* It is because Brian Kernighan was the first to write "hello, world" program for the documentation of the BCPL programming language developed by Martin Richards.
* Fixed formatting and improved readability