Fix typo in Installation section
### Motivation
At the official docs, there exists a typo. I want it to be fixed.
### Modifications
I have changed `pusar` to `pulsar` in docs Installation section.
@@ -10,7 +10,7 @@ All the methods in [producers](#producers), [consumers](#consumers), and [reader
## Installation
-You can install the [`pusar-client`](https://www.npmjs.com/package/pulsar-client) library via [npm](https://www.npmjs.com/).
+You can install the [`pulsar-client`](https://www.npmjs.com/package/pulsar-client) library via [npm](https://www.npmjs.com/).
### Requirements
Pulsar Node.js client library is based on the C++ client library.
