remove "alternative" from descriptions of builder callback (#3296)

packages/toolkit/src/createSlice.ts

@@ -100,9 +100,6 @@ export interface CreateSliceOptions<
    * A callback that receives a *builder* object to define
    * case reducers via calls to `builder.addCase(actionCreatorOrType, reducer)`.
    * 
-   * Alternatively, a mapping from action types to action-type-specific *case reducer*
-   * functions. These reducers should have existing action types used
-   * as the keys, and action creators will _not_ be generated.
    * 
    * @example
 ```ts

packages/toolkit/src/tests/createReducer.test.ts

@@ -254,7 +254,7 @@ describe('createReducer', () => {
     behavesLikeReducer(wrappedReducer)
   })
 
-  describe('alternative builder callback for actionMap', () => {
+  describe('builder callback for actionMap', () => {
     const increment = createAction<number, 'increment'>('increment')
     const decrement = createAction<number, 'decrement'>('decrement')
 

packages/toolkit/src/tests/createReducer.typetest.ts

@@ -70,7 +70,7 @@ import { expectType } from './helpers'
   })
 }
 
-/** Test:  alternative builder callback for actionMap */
+/** Test: builder callback for actionMap */
 {
   const increment = createAction<number, 'increment'>('increment')
 

packages/toolkit/src/tests/createSlice.test.ts

@@ -200,7 +200,7 @@ describe('createSlice', () => {
       expect(result).toBe(15)
     })
 
-    describe('alternative builder callback for extraReducers', () => {
+    describe('builder callback for extraReducers', () => {
       const increment = createAction<number, 'increment'>('increment')
 
       test('can be used with actionCreators', () => {

packages/toolkit/src/tests/createSlice.typetest.ts

@@ -398,7 +398,7 @@ const value = actionCreators.anyKey
   }
 }
 
-/** Test:  alternative builder callback for extraReducers */
+/** Test:  builder callback for extraReducers */
 {
   createSlice({
     name: 'test',

packages/toolkit/src/tests/mapBuilders.typetest.ts

@@ -5,7 +5,7 @@ import type { AnyAction } from '@reduxjs/toolkit'
 import { createAction } from '@reduxjs/toolkit'
 import { expectExactType, expectType } from './helpers'
 
-/** Test:  alternative builder callback for actionMap */
+/** Test:  builder callback for actionMap */
 {
   const increment = createAction<number, 'increment'>('increment')
   const decrement = createAction<number, 'decrement'>('decrement')