Update README.md

README.md

@@ -1,6 +1,6 @@
 # Learning Jenkins, 01-03: Install Jenkins on macOS
 
-# Prerequisites
+## Prerequisites
 The target system should be running a recent version of the macOS
 
 You will need to be able to access the system via CLI and via HTTP on port `8080`.
@@ -9,7 +9,7 @@ You will need to have [Homebrew](https://brew.sh/) installed.
 
 You may need to have `root` permission on the target system.
 
-# Installation
+## Installation
 In a terminal, run the following commands:
 ```
 brew install java
@@ -18,7 +18,7 @@ brew services start jenkins
 cat ~/.jenkins/secrets/initialAdminPassword
 ```
 
-# Using the Initial Admin Password
+## Using the Initial Admin Password
 Run the following command and copy the output:
 ```
 cat ~/.jenkins/secrets/initialAdminPassword