Clarify lockdown limitations in guide #11976

Job	Run time
Prepare	5s
Generate relay list	1m 13s
Generate debug keystore	3s
Build native (x86_64, x86_64, x86_64-linux-android)	3m 42s
Run lint and test tasks (testDebugUnitTest -x :test:arch:testDebugUnitTest :app:testOssProdDebugU...	5m 18s
Build native (i686, x86, i686-linux-android)	3m 47s
Run lint and test tasks (:test:arch:test --rerun-tasks)	2m 59s
Build native (aarch64, arm64-v8a, aarch64-linux-android)	3m 58s
Run lint and test tasks (detekt)	3m 35s
Build native (armv7, armeabi-v7a, armv7-linux-androideabi)	3m 56s
Run lint and test tasks (lint)	5m 52s
Build app	6m 55s
Build instrumented test packages (app, assembleOssProdAndroidTest, android/app/build/outputs/apk)	6m 31s
Build instrumented test packages (mockapi, :test:mockapi:assemble, android/test/mockapi/build/out...	4m 56s
Build instrumented test packages (e2e, :test:e2e:assemble, android/test/e2e/build/outputs/apk)	5m 20s
Run instrumented tests (app, android/app/build/outputs/apk, 1)	8m 58s
Run instrumented tests (mockapi, android/test/mockapi/build/outputs/apk, 0)	5s
Run instrumented e2e tests	0s
Run firebase tests	0s
	1h 7m 13s

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