Fix ATS opcodes names

Author: fggp

docs/spectral/ATS.md

@@ -10,9 +10,9 @@ ATS analysis files can be produced using the ATS software or the csound utility
 
 The opcodes for ATS processing are:
 
-* [ATSinfo](../opcodes/ATSinfo.md): reads data out of the header of an ATS file.
-* [ATSread](../opcodes/ATSread.md), [ATSreadnz](../opcodes/ATSreadnz.md), [ATSbufread](../opcodes/ATSbufread.md), [ATSinterpread](../opcodes/ATSinterpread.md), [ATSpartialtap](../opcodes/ATSpartialtap.md): read data from an ATS file or buffer.
-* [ATSadd](../opcodes/ATSadd.md), [ATSaddnz](../opcodes/ATSaddnz.md), [ATScross](../opcodes/ATScross.md), [ATSsinnoi](../opcodes/ATSsinnoi.md): Resynthesize sound.
+* [atsinfo](../opcodes/ATSinfo.md): reads data out of the header of an ATS file.
+* [atsread](../opcodes/ATSread.md), [atsreadnz](../opcodes/ATSreadnz.md), [atsbufread](../opcodes/ATSbufread.md), [atsinterpread](../opcodes/ATSinterpread.md), [atspartialtap](../opcodes/ATSpartialtap.md): read data from an ATS file or buffer.
+* [atsadd](../opcodes/ATSadd.md), [atsaddnz](../opcodes/ATSaddnz.md), [atscross](../opcodes/ATScross.md), [atssinnoi](../opcodes/ATSsinnoi.md): Resynthesize sound.
 
 ## Credits