[get-stream] fix typo and introduce more specific typings (#18314)

* [get-stream] fix typo and introduce more specific typings

* [get-stream] add myself to contributors list

types/get-stream/index.d.ts

@@ -1,18 +1,19 @@
 // Type definitions for get-stream 3.0
 // Project: https://github.com/sindresorhus/get-stream#readme
 // Definitions by: Douglas Duteil <https://github.com/douglasduteil>
+//                 BendingBender <https://github.com/BendingBender>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
 /// <reference types="node" />
 
-import {Stream} from 'stream';
+import { Stream } from 'stream';
 
 interface Options {
     /**
      * Encoding of the incoming stream.
      * @default 'utf8'
      */
-    encoding?: string;
+    encoding?: BufferEncoding | 'buffer';
     /**
      * Maximum length of the returned string. If it exceeds this value before
      * the stream ends, the promise will be rejected.
@@ -27,8 +28,8 @@ interface Options {
  * stream, indicating that there is no more data to be read.
  * The stream is switched to flowing mode.
  */
-declare function getStrem(stream: Stream, options?: Options): Promise<string>;
-declare namespace getStrem {
+declare function getStream(stream: Stream, options?: Options): Promise<string>;
+declare namespace getStream {
     /**
      * Get the `stream` as an array of values.
      *
@@ -58,4 +59,4 @@ declare namespace getStrem {
     function buffer(stream: Stream, options?: Options): Promise<Buffer>;
 }
 
-export = getStrem;
+export = getStream;