Fix some WPT typos

The tests themselves could also be improved, but for the time being
let's fix these typing mistakes.

Change-Id: Ibdc84f132326e6cc9beb7225b3fb3bc133470f45
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5053500
Reviewed-by: Sina Firoozabadi <sinafirooz@chromium.org>
Commit-Queue: Michael Wilson <mjwilson@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1228125}

webaudio/the-audio-api/the-audiobuffer-interface/acquire-the-content.html

@@ -68,7 +68,7 @@
   for (var i = 0; i < buf.length; i++) {
     // The convolver can introduce a slight numerical error.
     if (Math.abs(buf[i] - 1.0) > 0.0001) {
-      assert_true(false, `Invalid value at index ${i}, expecte close to 1.0, found ${buf[i]} when ${location}`)
+      assert_true(false, `Invalid value at index ${i}, expected close to 1.0, found ${buf[i]} when ${location}`)
       return Promise.reject();
     }
   }

webaudio/the-audio-api/the-audiobuffersourcenode-interface/active-processing.https.html

@@ -27,7 +27,7 @@
       let numberOfChannels = 7;
 
       // Number of frames in the AudioBuffer.  Fairly arbitrary, but should
-      // probablybe more than one render quantum and significantly less than
+      // probably be more than one render quantum and significantly less than
       // |renderLength|.
       let bufferFrames = 131;