Fix: change h1 to h2

Change for right TOC.

putty/README.md

 # PuTTY
 [PuTTY](https://www.chiark.greenend.org.uk/~sgtatham/putty/faq.html#faq-what) is a client program for the SSH on Windows OS.
 
-# Windows PuTTY Installer
+## Windows PuTTY Installer
 We recommend to download [Windows Installer](https://www.chiark.greenend.org.uk/~sgtatham/putty/latest.html) with PuTTY utilities as:
 * Pageant (SSH authentication agent) - store private key in memory without need to retype a passphrase on every login
 * PuTTYgen (PuTTY key generator) - convert OpenSSH format of id_rsa to PuTTY ppk private key and so on and so forth
 
-# PuTTY - Connect to the Instance
+## PuTTY - Connect to the Instance
 
 * Run PuTTY and enter Host name in format "login@Floating IP address" where [login](/quick-start#create-virtual-machine-instance) is for example debian for Debian OS and Floating IP is [IP address](/quick-start/#associate-floating-ip) to access instance from internet.
 * In Category -> Connection -> SSH -> Auth:
@@ -20,7 +20,7 @@ We recommend to download [Windows Installer](https://www.chiark.greenend.org.uk/
 
 ![](/putty/images/putty-connect2instance.png)
 
-# Pageant SSH Agent
+## Pageant SSH Agent
 
 * Run Pageant from Windows menu
 * Locate Pageant icon in the Notification Area and double click on it
@@ -32,7 +32,7 @@ We recommend to download [Windows Installer](https://www.chiark.greenend.org.uk/
 
 ![](/putty/images/pageant-add-key.png)
 
-# PuTTY key Generator
+## PuTTY key Generator
 
 PuTTYgen is the PuTTY key generator. You can load in an existing private key and change your passphrase or generate a new public/private key pair or convert to/from OpenSSH/PuTTY ppk formats.