Update README.md

Author: Vikrant Shah

README.md

@@ -102,9 +102,11 @@ When using multiple cameras, we have found that the only way to keep images betw
 Refer to the `params/multi-cam_example.yaml` for an example on how to setup the configuration. You must specify a master_cam which must be one of the cameras in the cam_ids list. This master camera is the camera that is either explicitly software triggered by the code or triggered internally via a counter at a given frame rate. All the other cameras are triggered externally when the master camera triggers. In order to make this work, the wiring must be such that the external signal from the master camera **Line2** is connected to **Line3** on all slave cameras. To connect cameras in this way:
 * Connect the primary (master) camera's pin 3 (red wire, GPIO) to each secondary (slave) camera's pin 1 (green wire, GPI).
 * Connect the primary (master) camera's pin 5 (blue wire, opto ground) and pin 6 (brown wire, ground) to each secondary (slave) camera's pin 6 (brown wire, ground).
-__GPIO Pinouts for Blackfly S__
-<img src="docs/images/bfs_GPIO.png" alt="GPIO Pinouts for Blackfly S" width="640" align="middle">  
-__GPIO Connections for Master/Slave config__
+
+**GPIO Pinouts for Blackfly S**  
+<img src="docs/images/bfs_GPIO.png" alt="GPIO Pinouts for Blackfly S" width="640" align="middle">
+
+**GPIO Connections for Master/Slave config**  
 <img src="docs/images/gpio_connections.png" alt="GPIO Connections for Master/Slave setup" width="360" align="middle">  
 
 ## License