init: clarify some text/README about 'critical' services

'Critical' services have rebooted into bootloader, like all other
catastrophic init crashes, for years now.  Update the text to match.

Test: n/a
Change-Id: Icfc41bf3e383958f14ecfaab9ca187e2c3dc7fd9
diff --git a/init/service.cpp b/init/service.cpp
index a3e5953..0b1425d 100644
--- a/init/service.cpp
+++ b/init/service.cpp
@@ -369,7 +369,7 @@
         return;
     }
 
-    // If we crash > 4 times in 4 minutes, reboot into recovery.
+    // If we crash > 4 times in 4 minutes, reboot into bootloader.
     boot_clock::time_point now = boot_clock::now();
     if ((flags_ & SVC_CRITICAL) && !(flags_ & SVC_RESTART)) {
         if (now < time_crashed_ + 4min) {