build: fixing trivial typo in comment in global header
@@ -1768,7 +1768,7 @@ int SPWATERFALL(_set_dims)(SPWATERFALL() _q, \
\
/* Push a single sample into the object, executing internal transform */ \
/* as necessary. */ \
-/* _q : spgram object */ \
+/* _q : spwaterfall object */ \
/* _x : input sample */ \
void SPWATERFALL(_push)(SPWATERFALL() _q, \
TI _x); \
