Adds document for self certified network capabilities

String from Android 14, the user must explicitly declare some
capabilities in the application if the application need to call
ConnectivityManager.requestNetwork() with those capabilities.

Test: atest FrameworksNetTests
Bug: 266524688
Change-Id: I8b4816ae3a425ff59d2c1ef09331e079b0e9596e
1 file changed