specially -> especially

* Update README.md

Simple change of
- "specially" -> "especially" when appropriate
- "fileformats" -> "file formats"

* Update README.md

Remove an unwanted change in the README file.

* Fixed various grammar mistakes

* Fixed various grammar mistakes

* Update README.md

So we can see which distributions package raylib.
And in which version they are.

Co-authored-by: resttime <resttime@users.noreply.github.com>