Update 3_vector_spaces.md

src/3_vector_spaces.md

@@ -4,13 +4,13 @@ title: Vector Spaces
 
 # Vector spaces
 
-The lecture on vector spaces consists of three parts:
+The lecture on vector spaces consists of **three parts**:
 
 - [Definition and basis dependence](#definition-and-basis-dependence)
 - [Properties of a vector space](#properties-vector-space)
 - [Matrix representation of vectors](#matrix-representation-vectors)
 
-The contents of this lecture are summarised in the following *videos*:
+The contents of this lecture are summarised in the following **videos**:
 - [3_vector_spaces_video1](https://www.dropbox.com/s/evytrbb55fgrcze/linear_algebra_01.mov?dl=0)
 - [3_vector_spaces_video2](https://www.dropbox.com/s/1530xb7zbuhwu6u/linear_algebra_02.mov?dl=0)
 - [3_vector_spaces_video3](https://www.dropbox.com/s/5lwkxd8lw5uwri9/linear_algebra_03.mov?dl=0)