Update API docs for the React Native tracker

Author: matus-tomlein

api-docs/docs/react-native-tracker/markdown/react-native-tracker.asyncstorage.getitem.md

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+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [@snowplow/react-native-tracker](./react-native-tracker.md) &gt; [AsyncStorage](./react-native-tracker.asyncstorage.md) &gt; [getItem](./react-native-tracker.asyncstorage.getitem.md)
+
+## AsyncStorage.getItem property
+
+<b>Signature:</b>
+
+```typescript
+getItem: (key: string) => Promise<string | null>;
+```

api-docs/docs/react-native-tracker/markdown/react-native-tracker.asyncstorage.md

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+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [@snowplow/react-native-tracker](./react-native-tracker.md) &gt; [AsyncStorage](./react-native-tracker.asyncstorage.md)
+
+## AsyncStorage interface
+
+<b>Signature:</b>
+
+```typescript
+export interface AsyncStorage 
+```
+
+## Properties
+
+|  Property | Type | Description |
+|  --- | --- | --- |
+|  [getItem](./react-native-tracker.asyncstorage.getitem.md) | (key: string) =&gt; Promise&lt;string \| null&gt; |  |
+|  [setItem](./react-native-tracker.asyncstorage.setitem.md) | (key: string, value: string) =&gt; Promise&lt;void&gt; |  |
+

api-docs/docs/react-native-tracker/markdown/react-native-tracker.asyncstorage.setitem.md

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+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [@snowplow/react-native-tracker](./react-native-tracker.md) &gt; [AsyncStorage](./react-native-tracker.asyncstorage.md) &gt; [setItem](./react-native-tracker.asyncstorage.setitem.md)
+
+## AsyncStorage.setItem property
+
+<b>Signature:</b>
+
+```typescript
+setItem: (key: string, value: string) => Promise<void>;
+```