More typo hunting, some grammatical changes

Author: tiagofassoni

doc/en/function/general.md

@@ -1,6 +1,6 @@
 ## Function Declarations and Expressions
 
-Functions in JavaScript are first class objects, that means that they can be 
+Functions in JavaScript are first class objects. That means they can be 
 passed around like any other value. One common use of this feature is to pass
 an *anonymous function* as a callback to another, possibly asynchronous function.
 
@@ -29,7 +29,7 @@ Due to the fact that `var` is a declaration, that hoists the variable name `foo`
 before the actual execution of the code starts, `foo` is already defined when 
 the script gets executed.
 
-But since assignments only happens at runtime, the value of `foo` will default
+But since assignments only happen at runtime, the value of `foo` will default
 to [undefined](#core.undefined) before the corresponding code is executed.
 
 ### Named function expression