Audio: STFT Process: Fix doxygen syntax error #22156

Job	Run time
build-windows (imx8 imx8x imx8m imx8ulp)	16m 3s
build-windows (-d, lnl)	9m 42s
build-windows (mtl lnl)	12m 9s
LP64-WIP	3m 53s
build-windows (ptl)	11m 18s
manifest-check	2m 40s
build-linux (mnfst, imx8 imx8x imx8m imx8ulp)	6m 42s
build-linux (zmain, imx8 imx8x imx8m imx8ulp)	6m 32s
build-linux (mnfst, ptl)	5m 36s
build-linux (-d, mnfst, lnl)	4m 24s
build-linux (mnfst, tgl tgl-h)	5m 30s
build-windows (tgl tgl-h)	10m 53s
build-linux (zmain, ptl)	5m 34s
build-linux (zmain, tgl tgl-h)	5m 19s
build-linux (mnfst, mtl lnl)	5m 42s
build-linux (mnfst, wcl imx95)	6m 49s
build-linux (zmain, mtl lnl)	5m 42s
compare-linux-win	27s
	2h 4m 55s

Provide feedback