fix: correct typos in user-facing invariant error messages

These typos appear in runtime-thrown invariant messages that
developers see when they misuse these APIs:

- StateSafePureComponent.js: 'acceessed' -> 'accessed'
  ('this.state should not be acceessed during state updates')

- CellRenderMask.js: 'number os cells' -> 'number of cells'
  ('CellRenderMask must contain a non-negative number os cells')

Author: itzsamdev

packages/virtualized-lists/Lists/CellRenderMask.js

@@ -23,7 +23,7 @@ export class CellRenderMask {
   constructor(numCells: number) {
     invariant(
       numCells >= 0,
-      'CellRenderMask must contain a non-negative number os cells',
+      'CellRenderMask must contain a non-negative number of cells',
     );
 
     this._numCells = numCells;

packages/virtualized-lists/Lists/StateSafePureComponent.js

@@ -74,7 +74,7 @@ export default class StateSafePureComponent<
       get() {
         invariant(
           !that._inAsyncStateUpdate,
-          '"this.state" should not be acceessed during state updates',
+          '"this.state" should not be accessed during state updates',
         );
         return state;
       },