fix: prop name for passwordRules (#27999)

Summary:
There was a typo in passwordRules prop for TextInput.

ref:
https://github.com/facebook/react-native/blob/master/ReactCommon/fabric/components/textinput/iostextinput/propsConversions.h#L106-L110
https://github.com/facebook/react-native/blob/master/Libraries/Components/TextInput/RCTSinglelineTextInputViewConfig.js#L126

## Changelog

[iOS] [Fixed] - Fix prop name of passwordRules in TextInput
Pull Request resolved: #27999

Test Plan: run `flow` type check with TextInput that has `passwordRules` in the prop.

Differential Revision: D19805819

Pulled By: TheSavior

fbshipit-source-id: a59729c466eb3f47675c7f1472bec269d6c3ed5d

Libraries/Components/TextInput/TextInput.js

@@ -267,7 +267,13 @@ type IOSProps = $ReadOnly<{|
    */
   textContentType?: ?TextContentType,
 
-  PasswordRules?: ?PasswordRules,
+  /**
+   * Provide rules for your password.
+   * For example, say you want to require a password with at least eight characters consisting of a mix of uppercase and lowercase letters, at least one number, and at most two consecutive characters.
+   * "required: upper; required: lower; required: digit; max-consecutive: 2; minlength: 8;"
+   * @platform ios
+   */
+  passwordRules?: ?PasswordRules,
 
   /*
    * @platform ios