Fixed typos (#7)

* Update functions.md

Fixed typo for variadic parameters:
... before the type not the name.

* Update integrated-jule.md

Fixed typo:
Librray -> Library

src/common-concepts/functions.md

@@ -56,7 +56,7 @@ fn main() {
     str_out("Hello", "World", "Variadic")
 }
 ```
-As seen in the example above, many arguments could be given to the function even though it was a single parameter. This is a result of the variadic parameter. Putting the `...` operator before its name makes parameter variadic. 
+As seen in the example above, many arguments could be given to the function even though it was a single parameter. This is a result of the variadic parameter. Putting the `...` operator before its type makes parameter variadic. 
 ::: tip
 - Each variadic parameter, actually is an slice.
 - Variadic parameters is not must have an argument in calling.
@@ -244,4 +244,4 @@ fn get_rate(x: int): int {
     }
 }
 ```
-The function does not have to return in the main scope, as the match expression above returns a return for every condition. 
+The function does not have to return in the main scope, as the match expression above returns a return for every condition. 

src/cpp/integrated-jule.md

@@ -6,7 +6,7 @@ In order to achieve good compatibility with Jule, it is recommended that C++ cod
 
 Integrated Jule is an essential part of C/C++ interoperability.
 
-## Librray
+## Library
 
 The `std::jule::integrated` standard library is a major supporter of Integrated Jule's interoperability pillar. It provides a standard for widely used C/C++ definitions. This makes it possible to spend less time on C/C++ definitions that link to Jule code. In addition, it can not only make things easier, but also improve and simplify the implementation by providing algorithms for a number of tasks.