Update README.md

README.md

@@ -34,13 +34,14 @@ The call to evaluate fitting function **FFIII** is:
 
 `ff3_out=ff3(Teff,logg,Z,EW,qiso)`
 
-where ff3_out is a two-element array returing the (logarithmic) 1D NLTE and 3D NLTE lithium abundances
+where ff3_out is a two-element array returning the (logarithmic) 1D NLTE and 3D NLTE lithium abundances
 
 `ff3_out[0] = ALI_1DNLTE`
 `ff3_out[1] = ALi_3DNLTE`
 
 for a given (logarithmic) equivalent width EW.
 
-The IDL script test_ff123.pro provided for convenience to IDL users producdes the otuput file 
+The IDL script test_ff123.pro, provided for the convenience of IDL users, produces the output file 
 test_ff123_idl.out with idenitcal content as test_ff123_py.out.
 
+