Update Simulation_parameters_doc.md

Author: giadarol

Simulation_parameters_doc.md

@@ -226,7 +226,7 @@ The following paramenters are used to define the file containing the initial e-c
 folder_path = '../../LHC_ecloud_distrib_quads/'
 N_mp_ele_quad = 500000
 sey_load_quad = 1.3
-filename_state = 'combined_distribution_sey_%.2f_sigmat_%.3fns_450Gev_N_mp_%d_symm'%(sey, sigma_z/c*1e9,N_mp_ele_quad)
+filename_state = 'combined_distribution_sey_%.2f_sigmat_%.3fns_450Gev_N_mp_%d_symm'%(sey_load_quad, sigma_z/c*1e9,N_mp_ele_quad)
 filename_init_MP_state_quad = folder_path + filename_state
 ```