nit fix

Author: elizabethtrykin

fern/sdk/mcp-server.mdx

@@ -36,7 +36,7 @@ Use this server to connect your AI workflows to real-world telephony, automate v
             "mcp-remote",
             "https://mcp.vapi.ai/sse",
             "--header",
-            "Authorization: Bearer ${YOUR_VAPI_API_KEY}"
+            "Authorization: Bearer ${VAPI_TOKEN}"
           ],
           "env": {
             "VAPI_TOKEN": "YOUR_VAPI_API_KEY"
@@ -106,7 +106,7 @@ The Vapi MCP Server exposes these actions as MCP tools:
             "mcp-remote",
             "https://mcp.vapi.ai/mcp",
             "--header",
-            "Authorization: Bearer ${YOUR_VAPI_API_KEY}"
+            "Authorization: Bearer ${VAPI_TOKEN}"
           ],
           "env": {
             "VAPI_TOKEN": "YOUR_VAPI_API_KEY"
@@ -137,7 +137,7 @@ The Vapi MCP Server exposes these actions as MCP tools:
             "mcp-remote",
             "https://mcp.vapi.ai/sse",
             "--header",
-            "Authorization: Bearer ${YOUR_VAPI_API_KEY}"
+            "Authorization: Bearer ${VAPI_TOKEN}"
           ],
           "env": {
             "VAPI_TOKEN": "YOUR_VAPI_API_KEY"