docs: align roots terminology with MCP spec clarification #2534

Job	Run time
build (ubuntu-latest, Release)	12m 52s
build (macos-latest, Debug)	5m 34s
build (windows-latest, Release)	11m 35s
build (ubuntu-latest, Debug)	13m 19s
build (macos-latest, Release)	4m 32s
build (windows-latest, Debug)	10m 50s
publish-coverage	-1s
	58m 41s

Provide feedback