Fix capitalization in Honeybadger user settings link

Author: joshuap

README.md

@@ -11,7 +11,7 @@ First, pull the Docker image:
 docker pull ghcr.io/honeybadger-io/honeybadger-mcp-server:latest
 ```
 
-Then, configure your MCP client(s). You can find your personal API key under the "Authentication" tab in your [Honeybadger User settings](https://app.honeybadger.io/users/edit#authentication).
+Then, configure your MCP client(s). You can find your personal API key under the "Authentication" tab in your [Honeybadger user settings](https://app.honeybadger.io/users/edit#authentication).
 
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