fix: correct JSDoc typos in virtualized-lists

- FillRateHelper.js: fix typo 'maximem' -> 'maximum' in class JSDoc
- ViewabilityHelper.js: fix incorrect prop name in comment
  'viewAreaPercentThreshold' -> 'viewAreaCoveragePercentThreshold'
  (the correct name as defined in ViewabilityConfig type above)

Author: itzsamdev

packages/virtualized-lists/Lists/FillRateHelper.js

@@ -38,7 +38,7 @@ let _minSampleCount = 10;
 let _sampleRate = DEBUG ? 1 : null;
 
 /**
- * A helper class for detecting when the maximem fill rate of `VirtualizedList` is exceeded.
+ * A helper class for detecting when the maximum fill rate of `VirtualizedList` is exceeded.
  * By default the sampling rate is set to zero and this will do nothing. If you want to collect
  * samples (e.g. to log them), make sure to call `FillRateHelper.setSampleRate(0.0-1.0)`.
  *

packages/virtualized-lists/Lists/ViewabilityHelper.js

@@ -55,7 +55,7 @@ export type ViewabilityConfig = Readonly<{
   viewAreaCoveragePercentThreshold?: number,
 
   /**
-   * Similar to `viewAreaPercentThreshold`, but considers the percent of the item that is visible,
+   * Similar to `viewAreaCoveragePercentThreshold`, but considers the percent of the item that is visible,
    * rather than the fraction of the viewable area it covers.
    */
   itemVisiblePercentThreshold?: number,