Update 07.5.md

Jimmy99 · jameswpm · commit 534e6744b54d · 2016-09-27T16:13:43.000-03:00
typographical errors and improved readability
diff --git a/en/07.5.md b/en/07.5.md
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 # 7.5 Files
 
-Files are must-have objects on every single computer device. It won't come as any surprise to you that web applications also make heavy use of them. In this section, we're going to learn how to operate on files in Go.
+Files are essential objects on every single computer device. It won't come as any surprise to you that web applications also make heavy use of them. In this section, we're going to learn how to operate on files in Go.
 
 ## Directories
 
