Add a note to js sdks that they rely on the fetch api (#641)

Add a note to js sdks that they rely on the fetch api with a link to info about polyfilling

docs/sdk/client-side-sdks/javascript/javascript.md

@@ -14,5 +14,8 @@ It will then update its configuration using a realtime streaming connection any
 The DevCycle JS SDK is available as a NPM package will a full Typescript interface. 
 The open-source code can be viewed on the [DevCycle GitHub](https://github.com/DevCycleHQ/js-sdks/tree/main/sdk/js).
 
+This SDK depends on the [fetch](https://github.com/BuilderIO/this-package-uses-fetch) API.
+
+
 [![Npm package version](https://badgen.net/npm/v/@devcycle/js-client-sdk)](https://www.npmjs.com/package/@devcycle/js-client-sdk)
 [![GitHub](https://img.shields.io/github/stars/devcyclehq/js-sdks.svg?style=social&label=Star&maxAge=2592000)](https://github.com/devcyclehq/js-sdks)

docs/sdk/client-side-sdks/nextjs/nextjs.md

@@ -12,6 +12,7 @@ The DevCycle Next.js SDK lets you easily integrate your Next.js applications wit
 <CustomDocCardList items={useCurrentSidebarCategory().items} columnWidth={4} />
 
 The SDK is available as a package on npm. It is also open source and can be viewed on Github.
+This SDK depends on the [fetch](https://github.com/BuilderIO/this-package-uses-fetch) API.
 
 [![Npm package version](https://badgen.net/npm/v/@devcycle/nextjs-sdk)](https://www.npmjs.com/package/@devcycle/nextjs-sdk)
 [![GitHub](https://img.shields.io/github/stars/devcyclehq/js-sdks.svg?style=social&label=Star&maxAge=2592000)](https://github.com/DevCycleHQ/js-sdks/tree/main/sdk/nextjs)

docs/sdk/client-side-sdks/react/react.md

@@ -18,6 +18,7 @@ Currently, DevCycle for React only supports access via functional component hook
 <CustomDocCardList items={useCurrentSidebarCategory().items} columnWidth={4} />
 
 The SDK is available as a package on npm. It is also open source and can be viewed on Github.
+This SDK depends on the [fetch](https://github.com/BuilderIO/this-package-uses-fetch) API.
 
 [![Npm package version](https://badgen.net/npm/v/@devcycle/react-client-sdk)](https://www.npmjs.com/package/@devcycle/react-client-sdk)
 [![GitHub](https://img.shields.io/github/stars/devcyclehq/js-sdks.svg?style=social&label=Star&maxAge=2592000)](https://github.com/devcyclehq/js-sdks)