Update Linear Algebra Readme (TheAlgorithms#1298)

Update formatting to better indicate matrix and vector sections

Author: AgentEnder

linear_algebra/README.md

@@ -6,7 +6,8 @@ This module contains some useful classes and functions for dealing with linear a
 
 ## Overview  
 
-- class Vector  
+### class Vector  
+-
     - This class represents a vector of arbitray size and operations on it.  
 
     **Overview about the methods:**    
@@ -32,7 +33,8 @@ This module contains some useful classes and functions for dealing with linear a
 - function randomVector(N,a,b)
     - returns a random vector of size N, with random integer components between 'a' and 'b'.
 
-- class Matrix
+### class Matrix
+-
     - This class represents a matrix of arbitrary size and operations on it.
 
     **Overview about the methods:**