docs: fix incorrect imports (#2656)

# Summary

`USAGE.md` had some incorrect import paths. This minor PR fixes those.

## Test Plan

Test that the updated import paths are functional, and are consistent
with the rest of `USAGE.md`.

### What's required for testing (prerequisites)?

N/A

### What are the steps to reproduce (after prerequisites)?

N/A

## Compatibility

N/A

## Checklist

<!-- Check completed item, when applicable, via: [X] -->

- I have tested this on a device and a simulator
- I added documentation in `README.md`
- I updated the typed files (typescript)
- I added a test for the API in the `__tests__` folder

Signed-off-by: Rifa Achrinza <25147899+achrinza@users.noreply.github.com>

Author: achrinza

USAGE.md

@@ -125,7 +125,7 @@ existing in a different way and `fallback` if you want to render another compone
 
 ```jsx
 import * as React from 'react';
-import { SvgUri } from 'react-native-svg/css';
+import { SvgUri } from 'react-native-svg';
 import { SvgFallback } from './components/SvgFallback';
 
 export default () => {
@@ -315,7 +315,7 @@ If xml string contains CSS in `<style>` element, use `SvgCss`:
 
 ```jsx
 import * as React from 'react';
-import { SvgCss } from 'react-native-svg';
+import { SvgCss } from 'react-native-svg/css';
 
 const xml = `
   <svg width="32" height="32" viewBox="0 0 32 32">