Use a comma for introductory clauses.

Remove comma before "that".
Fix incomplete sentence.

Author: XP1

doc/en/types/typeof.md

@@ -33,7 +33,7 @@ object.
     {}                  Object     object
     new Object()        Object     object
 
-In the above table *Type* refers to the value, that the `typeof` operator returns.
+In the above table, *Type* refers to the value that the `typeof` operator returns.
 As can be clearly seen, this value is anything but consistent.
 
 The *Class* refers to the value of the internal `[[Class]]` property of an object.
@@ -42,7 +42,7 @@ The *Class* refers to the value of the internal `[[Class]]` property of an objec
 > following strings. `Arguments`, `Array`, `Boolean`, `Date`, `Error`, 
 > `Function`, `JSON`, `Math`, `Number`, `Object`, `RegExp`, `String`.
 
-In order to retrieve the value of `[[Class]]` one has to make use of the
+In order to retrieve the value of `[[Class]]`, one has to make use of the
 `toString` method of `Object.prototype`.
 
 ### The Class of an Object
@@ -77,7 +77,7 @@ referencing it would result in a `ReferenceError`. This is the only thing
 ### In Conclusion
 
 In order to check the type of an object, it is highly recommended to use 
-`Object.prototype.toString`; as this is the only reliable way of doing so. 
+`Object.prototype.toString` because this is the only reliable way of doing so. 
 As shown in the above type table, some return values of `typeof` are not defined 
 in the specification; thus, they can differ across various implementations.