Accessibility: Fix Screen Reader Functionality of FormItem; Remove title attribute from FormItemLabel

• I have searched the issues of this repository and believe that this is not a duplicate.

Reproduction link

Steps to reproduce

1. Open the reproduction link in Chrome
2. Enable MacOS VoiceOver utility and focus the “First Name” field - the form label is not read aloud
3. Inspect the Form.Item “First Name” label in your browser dev tools
4. Delete the “title” attribute on the label element in dev tools
5. Focus the “First Name” field - the form label is read aloud

What is expected?

The field label should be read aloud by MacOS VoiceOver utility when the field is focused

What is actually happening?

The field label is not read aloud by MacOS VoiceOver utility

Environment	Info
antd	4.16.11
React	react
System	MacOS
Browser	Chrome

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The fix seems as simple as removing title={typeof label === 'string' ? label : ''} from the FormItemLabel.tsx component. But, I can’t tell from the git history why the label element received the title attribute. I’m happy to create a PR, but I want to validate that attribute is not necessary for other use cases before creating a PR.

[afc163]

1. Your codesandbox doesn’t include Form component.
2. Could you record a video to show how Screen Reader cannot work?

[afc163]

Screen Reader works well in Firefox browser but read as edit text blank in Chrome.