updated a help file

doc/3.audio.examples/I01.Fourier.analysis.pd

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+#N canvas 247 4 688 708 12;
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@@ -12,7 +12,7 @@
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-#N canvas 0 0 450 300 graph1 0;
+#N canvas 0 0 450 300 (subpatch) 0;
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@@ -20,8 +20,8 @@
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-#X text 504 163 real part;
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 #X text 94 166 <- frequency;
 #X text 133 182 (as multiple;