docs(mcp): correct MCPServerPlugin's docblock to the canonical stdio switch #29986

Job	Run time
filter	16s
Build Core	1m 31s
Dogfood Regression Gate (3/3)	4m 0s
Dogfood Verify CLI	1m 52s
Temporal Conformance (live PG + MySQL)	4m 52s
Test Core (2/6)	1m 11s
Dogfood Regression Gate (2/3)	3m 23s
Test Core (5/6)	2m 2s
Dogfood Regression Gate (1/3)	3m 37s
Test Core (6/6)	4m 37s
Test Core (4/6)	1m 16s
Test Core (1/6)	16m 44s
Test Core (3/6)	1m 23s
Build Docs	0s
Console Pin Gate	0s
Dogfood Regression Gate	15s
Test Core	14s
	47m 13s

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