chore(docs): standardize "AIBridge" to "AI Bridge" in documentation (#20831)

cli/testdata/coder_server_--help.golden

@@ -80,7 +80,7 @@ OPTIONS:
           Periodically check for new releases of Coder and inform the owner. The
           check is performed once per day.
 
-AIBRIDGE OPTIONS: 
+AI BRIDGE OPTIONS: 
       --aibridge-anthropic-base-url string, $CODER_AIBRIDGE_ANTHROPIC_BASE_URL (default: https://api.anthropic.com/)
           The base URL of the Anthropic API.
 
@@ -114,9 +114,9 @@ AIBRIDGE OPTIONS:
           Whether to start an in-memory aibridged instance.
 
       --aibridge-inject-coder-mcp-tools bool, $CODER_AIBRIDGE_INJECT_CODER_MCP_TOOLS (default: false)
-          Whether to inject Coder's MCP tools into intercepted AIBridge requests
-          (requires the "oauth2" and "mcp-server-http" experiments to be
-          enabled).
+          Whether to inject Coder's MCP tools into intercepted AI Bridge
+          requests (requires the "oauth2" and "mcp-server-http" experiments to
+          be enabled).
 
       --aibridge-openai-base-url string, $CODER_AIBRIDGE_OPENAI_BASE_URL (default: https://api.openai.com/v1/)
           The base URL of the OpenAI API.