add new am examples to doc

website/src/pages/learn/effects.mdx

@@ -57,6 +57,34 @@ Each filter has 2 parameters:
 
 <JsDoc client:idle name="vowel" h={0} />
 
+# Amplitude Modulation
+
+Amplitude modulation changes the amplitude (gain) periodically over time.
+
+## am
+
+<JsDoc client:idle name="am" h={0} />
+
+## amsync
+
+<JsDoc client:idle name="amsync" h={0} />
+
+## amdepth
+
+<JsDoc client:idle name="amdepth" h={0} />
+
+## amskew
+
+<JsDoc client:idle name="amskew" h={0} />
+
+## amphase
+
+<JsDoc client:idle name="amphase" h={0} />
+
+## amshape
+
+<JsDoc client:idle name="amshape" h={0} />
+
 # Amplitude Envelope
 
 The amplitude [envelope](<https://en.wikipedia.org/wiki/Envelope_(music)>) controls the dynamic contour of a sound.