docs: fix some typos in comments and strings

Couple of typos fixed:
- occuring -> occurring
- imlement -> implement
- idenitifer -> identifer
etc...

Closes #5943

modules/benchpress/src/metric/perflog_metric.ts

@@ -111,7 +111,7 @@ export class PerflogMetric extends Metric {
 
   _endPlainMeasureAndMeasureForceGc(restartMeasure: boolean) {
     return this._endMeasure(true).then((measureValues) => {
-      // disable frame capture for measurments during forced gc
+      // disable frame capture for measurements during forced gc
       var originalFrameCaptureValue = this._captureFrames;
       this._captureFrames = false;
       return this._driverExtension.gc()

modules/benchpress/src/webdriver/chrome_driver_extension.ts

@@ -103,7 +103,7 @@ export class ChromeDriverExtension extends WebDriverExtension {
         //   2nd choice: BenchmarkInstrumentation::DisplayRenderingStats - available on systems with
         //               new surfaces framework (not broadly enabled yet)
         //   3rd choice: BenchmarkInstrumentation::ImplThreadRenderingStats - fallback event that is
-        //               allways available if something is rendered
+        //               always available if something is rendered
         var frameCount = event['args']['data']['frame_count'];
         if (frameCount > 1) {
           throw new BaseException('multi-frame render stats not supported');