Address WebAudio#2185: Fix some bikeshed errors

Fixing links to parameters to the constructor. Basically, we
previously had something like
```
{{PeriodicWave/PeriodicWave(context, options)/options!!argument}}
```
and replace it with
```
{{PeriodicWave/constructor(context, options)/options!!argument}}
```

Author: rtoy

index.bs

@@ -9031,7 +9031,7 @@ Constructors</h4>
 		<div algorithm="construct periodic wave">
 			1. Let <var>p</var> be a new {{PeriodicWave}} object. Let <dfn attribute for="PeriodicWave">\[[real]]</dfn> and <dfn attribute for="PeriodicWave">\[[imag]]</dfn> be two internal slots of type {{Float32Array}}, and let <dfn attribute for="PeriodicWave">\[[normalize]]</dfn> be an internal slot.
 
-			1. Process {{PeriodicWave/PeriodicWave(context, options)/options!!argument}} according to one of the following cases:
+			1. Process {{PeriodicWave/constructor(context, options)/options!!argument}} according to one of the following cases:
 				1. If both {{PeriodicWaveOptions/real|options.real}} and {{PeriodicWaveOptions/imag|options.imag}} are present
 					1. <span class="synchronous">If the lengths of {{PeriodicWaveOptions/real|options.real}} and {{PeriodicWaveOptions/imag|options.imag}} are different or if either length is less than 2, throw an {{IndexSizeError}} and abort this algorithm.</span>
 					1. Set {{[[real]]}} and {{[[imag]]}} to new arrays with the same length as {{PeriodicWaveOptions/real|options.real}}.