[compiler] Tweak intro section on manual memo guidance (#7953)

The previous sentence "If you are using React Compiler, useMemo, useCallback, and React.memo can be removed." was coming off a bit too strong and makes it incorrectly seem like the manual memos and compiler memos are 1:1.

Removing the sentence doesn't take anything away from this paragraph, so let's remove it to reduce confusion.

Author: poteto

src/content/learn/react-compiler/introduction.md

@@ -154,7 +154,7 @@ Next.js users can enable the swc-invoked React Compiler by using [v15.3.1](https
 
 ## What should I do about useMemo, useCallback, and React.memo? {/*what-should-i-do-about-usememo-usecallback-and-reactmemo*/}
 
-If you are using React Compiler, [`useMemo`](/reference/react/useMemo), [`useCallback`](/reference/react/useCallback), and [`React.memo`](/reference/react/memo) can be removed. React Compiler adds automatic memoization more precisely and granularly than is possible with these hooks. If you choose to keep manual memoization, React Compiler will analyze them and determine if your manual memoization matches its automatically inferred memoization. If there isn't a match, the compiler will choose to bail out of optimizing that component.
+React Compiler adds automatic memoization more precisely and granularly than is possible with [`useMemo`](/reference/react/useMemo), [`useCallback`](/reference/react/useCallback), and [`React.memo`](/reference/react/memo). If you choose to keep manual memoization, React Compiler will analyze them and determine if your manual memoization matches its automatically inferred memoization. If there isn't a match, the compiler will choose to bail out of optimizing that component.
 
 This is done out of caution as a common anti-pattern with manual memoization is using it for correctness.  This means your app depends on specific values being memoized to work properly. For example, in order to prevent an infinite loop, you may have memoized some values to stop a `useEffect` call from firing. This breaks the Rules of React, but since it can potentially be dangerous for the compiler to automatically remove manual memoization, the compiler will just bail out instead. You should manually remove your handwritten memoization and verify that your app still works as expected.