Improper formatting of some files

Some of these files seem really rushed and aren't formatted properly (either not proper Markdown or not a Markdown file at all) making it hard for some users to read.

Examples:
https://github.com/avsingh999/Ruby-for-Beginner/blob/master/Functions-in-Ruby
https://github.com/avsingh999/Ruby-for-Beginner/blob/master/Array_in_Ruby.md
https://github.com/avsingh999/Ruby-for-Beginner/blob/master/Block_in_Ruby.md
https://github.com/avsingh999/Ruby-for-Beginner/blob/master/How%20to%20find%20index%20of%20element%20in%20array%20ruby.md

Review the four linked files: Functions-in-Ruby, Array_in_Ruby.md, Block_in_Ruby.md, and How to find index of element in array ruby.md, comparing them with the repository’s existing Markdown conventions. No test command is mentioned; the work is done when these examples are consistently formatted and readable, with the non-Markdown file handled appropriately.

Written by the indexing model from the issue text.