Typo fix in some comments and test descriptions: 'overriden' -> 'overridden' (#6413)

minor typo fix

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## Technical description of changes

## Screenshots of UI changes (or N/A)

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Author: abhigyadufare

tensorboard/webapp/feature_flag/effects/feature_flag_effects.ts

@@ -90,7 +90,7 @@ export class FeatureFlagEffects {
   );
 
   /**
-   * When a feature flag is overriden this effect persists that override by
+   * When a feature flag is overridden this effect persists that override by
    * putting it in local storage using the dataSource.
    */
   readonly storeFeatureFlag$ = createEffect(

tensorboard/webapp/feature_flag/store/feature_flag_selectors_test.ts

@@ -120,7 +120,7 @@ describe('feature_flag_selectors', () => {
   });
 
   describe('#getFeatureFlagsToSendToServer', () => {
-    it('returns overriden flags to send to server', () => {
+    it('returns overridden flags to send to server', () => {
       // Give explicit defaultValues and modify sendToServer value for some of
       // the properties.
       const metadata = {
@@ -165,7 +165,7 @@ describe('feature_flag_selectors', () => {
       expect(actual).toEqual({inColab: true});
     });
 
-    it('ignores overriden flags that should not be sent to server', () => {
+    it('ignores overridden flags that should not be sent to server', () => {
       // Give explicit defaultValues and modify sendToServer value for some of
       // the properties.
       const metadata = {

tensorboard/webapp/routes/feature_flag_serializer.ts

@@ -26,7 +26,7 @@ export function featureFlagsToSerializableQueryParams<T>(
   return Object.entries(overriddenFeatureFlags)
     .map(([featureFlag, featureValue]) => {
       if (featureValue === undefined) {
-        // Feature flag has no overriden value specified.
+        // Feature flag has no overridden value specified.
         // Return empty item. Will be filtered out.
         return {};
       }

tensorboard/webapp/webapp_data_source/tb_feature_flag_data_source_types.ts

@@ -43,7 +43,7 @@ export abstract class TBFeatureFlagDataSource {
 
   /**
    * Removes the localStorage override of the given flag. If the flag is not
-   * overriden no changes should occur.
+   * overridden no changes should occur.
    *
    * @param featureFlag The featureFlag to be reset. It must be a key in the
    * FeatureFlags object.