Fix typos in comments (#35701)

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## Summary
This PR fixes a few small spelling errors in comments across the
codebase (`teh`→`the`, `occuring`→`occurring`, `occured`→`occurred`). No
behavior changes.

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This is a comments-only change. I verified the diff is limited to
comment text and does not affect logic or runtime behavior.

Author: pavan-sh

packages/react-dom-bindings/src/client/ReactFiberConfigDOM.js

@@ -4062,7 +4062,7 @@ export function registerSuspenseInstanceRetry(
     instance.data !== SUSPENSE_PENDING_START_DATA ||
     // The boundary is still in pending status but the document has finished loading
     // before we could register the event handler that would have scheduled the retry
-    // on load so we call teh callback now.
+    // on load so we call the callback now.
     ownerDocument.readyState !== DOCUMENT_READY_STATE_LOADING
   ) {
     callback();

packages/react-reconciler/src/ReactFiberWorkLoop.js

@@ -3034,7 +3034,7 @@ function renderRootConcurrent(root: FiberRoot, lanes: Lanes): RootExitStatus {
 function workLoopConcurrent(nonIdle: boolean) {
   // We yield every other "frame" when rendering Transition or Retries. Those are blocking
   // revealing new content. The purpose of this yield is not to avoid the overhead of yielding,
-  // which is very low, but rather to intentionally block any frequently occuring other main
+  // which is very low, but rather to intentionally block any frequently occurring other main
   // thread work like animations from starving our work. In other words, the purpose of this
   // is to reduce the framerate of animations to 30 frames per second.
   // For Idle work we yield every 5ms to keep animations going smooth.

packages/react-reconciler/src/__tests__/ReactAsyncActions-test.js

@@ -1700,7 +1700,7 @@ describe('ReactAsyncActions', () => {
     'regression: updates in an action passed to React.startTransition are batched ' +
       'even if there were no updates before the first await',
     async () => {
-      // Regression for a bug that occured in an older, too-clever-by-half
+      // Regression for a bug that occurred in an older, too-clever-by-half
       // implementation of the isomorphic startTransition API. Now, the
       // isomorphic startTransition is literally the composition of every
       // reconciler instance's startTransition, so the behavior is less likely