fix other references to Node LTS

Signed-off-by: Pawel Wamej <pwamej@gmail.com>

docs/getting-started/create-an-app.md

@@ -16,8 +16,7 @@ may want to [Run Backstage Locally](./running-backstage-locally.md) instead.
 ## Create an app
 
 To create a Backstage app, you will need to have
-[Node.js](https://nodejs.org/en/download/) Active LTS Release installed
-(currently v14).
+Node.js [Active LTS Release](https://nodejs.org/en/about/releases/) installed.
 
 Backstage provides a utility for creating new apps. It guides you through the
 initial setup of selecting the name of the app and a database for the backend.

docs/getting-started/running-backstage-locally.md

@@ -13,13 +13,14 @@ trying to contribute, follow the instructions to
 
 - Node.js
 
-First make sure you are using Node.js with an Active LTS Release, currently v14.
+First make sure you are using Node.js with an [Active LTS Release](https://nodejs.org/en/about/releases/).
 This is made easy with a version manager such as
 [nvm](https://github.com/nvm-sh/nvm) which allows for version switching.
 
 ```bash
-# Installing a new version
-nvm install 14
+# Installing current LTS release
+nvm install --lts
+> Installing latest LTS version.
 > Downloading and installing node v14.15.1...
 > Now using node v14.15.1 (npm v6.14.8)