add another spell checker

Author: bitfl0wer

.vscode/extensions.json

@@ -5,6 +5,7 @@
         "valentjn.vscode-ltex",
         "gruntfuggly.todo-tree",
         "typespec.typespec-vscode",
-        "bierner.markdown-mermaid"
+        "bierner.markdown-mermaid",
+        "streetsidesoftware.code-spell-checker"
     ]
 }

.vscode/settings.json

@@ -10,5 +10,9 @@
 		"tag:yaml.org,2002:python/name:material.extensions.emoji.twemoji",
 		"tag:yaml.org,2002:python/name:pymdownx.superfences.fence_code_format"
 	],
-	"editor.formatOnSave": false
+	"editor.formatOnSave": false,
+	"cSpell.enabled": true,
+	"cSpell.words": [
+		"polyproto"
+	]
 }

docs/Protocol Specifications/core.md

@@ -272,7 +272,7 @@ The following opcodes are defined by the `core` namespace:
 
 #### 3.2.2 Heartbeats
 
-Heartbeats are used to keep the WebSocket connection alive. The client continouusly sends a heartbeat
+Heartbeats are used to keep the WebSocket connection alive. The client continuously sends a heartbeat
 event to the server with the interval specified in the "Hello" event payload.
 The server must acknowledge the heartbeat event by sending a heartbeat ACK event back to the client.