Bug 2005087 - Document the fact that the isolation strategy pref is overridden on Android r=tcampbell

Differential Revision: https://phabricator.services.mozilla.com/D275699

Author: owlishDeveloper

modules/libpref/init/StaticPrefList.yaml

@@ -6195,6 +6195,9 @@
 # The strategy used to control how sites are isolated into separate processes
 # when Fisison is enabled. This pref has no effect if Fission is disabled.
 # See the `WebContentIsolationStrategy` enum in `ProcessIsolation.cpp`.
+# On Android, this is currently overridden: for Fenix - via nimbus.fml.yml,
+# and for other Andoid Components consumers value 2 is hardcoded
+# in the default settings in mozilla.components.concept.engine.Settings
 - name: fission.webContentIsolationStrategy
   type: uint32_t
   value: 1