http2: fix [kInspect]() output for Http2Stream

This fixes a typo in the util.inspect output of Http2Stream. It
previously had writeableSate instead of writableState.

PR-URL: #14753
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Timothy Gu <timothygu99@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

Author: evanlucas

lib/internal/http2/core.js

@@ -1315,7 +1315,7 @@ class Http2Stream extends Duplex {
       id: this[kID],
       state: this.state,
       readableState: this._readableState,
-      writeableSate: this._writableState
+      writableState: this._writableState
     };
     return `Http2Stream ${util.format(obj)}`;
   }

test/parallel/test-http2-stream-client.js

@@ -0,0 +1,29 @@
+// Flags: --expose-http2
+'use strict';
+
+const common = require('../common');
+if (!common.hasCrypto)
+  common.skip('missing crypto');
+const assert = require('assert');
+const http2 = require('http2');
+const util = require('util');
+
+const server = http2.createServer();
+server.on('stream', common.mustCall((stream) => {
+  assert.strictEqual(stream.aborted, false);
+  const insp = util.inspect(stream);
+  assert.ok(/Http2Stream { id/.test(insp));
+  assert.ok(/  state:/.test(insp));
+  assert.ok(/  readableState:/.test(insp));
+  assert.ok(/  writableState:/.test(insp));
+  stream.end('ok');
+}));
+server.listen(0, common.mustCall(() => {
+  const client = http2.connect(`http://localhost:${server.address().port}`);
+  const req = client.request();
+  req.resume();
+  req.on('streamClosed', common.mustCall(() => {
+    client.destroy();
+    server.close();
+  }));
+}));