Fix #1363: Link to Oscillator computed frequency

Make the definitions of Oscillator frequency and detune link to
`computedOscFrequency` to make it clear how the frequency and detune
`AudioParam`s form the compound parameter.

index.html

@@ -15895,14 +15895,14 @@ <h2>
         <p>
           Both <code>frequency</code> and <code>detune</code> are <a>a-rate</a>
           parameters, and form a <a>compound parameter</a>. They are used
-          together to determine a <em>computedFrequency</em> value:
+          together to determine a <dfn>computedOscFrequency</dfn> value:
         </p>
         <pre>
-  computedFrequency(t) = frequency(t) * pow(2, detune(t) / 1200)
+  computedOscFrequency(t) = frequency(t) * pow(2, detune(t) / 1200)
 </pre>
         <p>
           The OscillatorNode's instantaneous phase at each time is the definite
-          time integral of <em>computedFrequency</em>, assuming a phase angle
+          time integral of <a>computedOscFrequency</a>, assuming a phase angle
           of zero at the node's exact start time. Its <a>nominal range</a> is
           [-<a>Nyquist frequency</a>, <a>Nyquist frequency</a>].
         </p>
@@ -16102,8 +16102,9 @@ <h3>
               A detuning value (in cents) which will offset the
               <a><code>frequency</code></a> by the given amount. Its default
               <code>value</code> is 0. This parameter is <a>a-rate</a>. It
-              forms a <a>compound parameter</a> with <code>frequency</code>.
-              Its <a>nominal range</a> is \((-\infty, \infty)\).
+              forms a <a>compound parameter</a> with <code>frequency</code> to
+              form the <a>computedOscFrequency</a>. Its <a>nominal range</a> is
+              \((-\infty, \infty)\).
             </dd>
             <dt>
               <code><dfn>frequency</dfn></code> of type <span class=
@@ -16112,9 +16113,9 @@ <h3>
             <dd>
               The frequency (in Hertz) of the periodic waveform. Its default
               <code>value</code> is 440. This parameter is <a>a-rate</a>. It
-              forms a <a>compound parameter</a> with <code>detune</code>. Its
-              <a>nominal range</a> is [-<a>Nyquist frequency</a>, <a>Nyquist
-              frequency</a>].
+              forms a <a>compound parameter</a> with <code>detune</code> to
+              form the <a>computedOscFrequency</a>. Its <a>nominal range</a> is
+              [-<a>Nyquist frequency</a>, <a>Nyquist frequency</a>].
             </dd>
             <dt>
               <code><dfn>type</dfn></code> of type <span class=