Update Controls

Controls.md

@@ -1,4 +1,5 @@
 List of controls consists of all parameters needed for proper dataset acquisition design:
+#### Beam
 - **Aperture** probe forming aperture gives probe semi-angle (α)
 - **Energy** energy of primary electron beam in keV ... gives final pixel size
 - **Probe** probe setting together with chosen probe forming aperture give probe current