Add documentation for --gunit_recreate_environments_when_repeating.

PiperOrigin-RevId: 485895339
Change-Id: I09b0f535941531ef7bcb74593d385891d56b3e32

Author: Abseil Team

docs/advanced.md

@@ -1913,8 +1913,12 @@ Repeat the tests whose name matches the filter 1000 times.
 
 If your test program contains
 [global set-up/tear-down](#global-set-up-and-tear-down) code, it will be
-repeated in each iteration as well, as the flakiness may be in it. You can also
-specify the repeat count by setting the `GTEST_REPEAT` environment variable.
+repeated in each iteration as well, as the flakiness may be in it. To avoid
+repeating global set-up/tear-down, specify
+`--gtest_recreate_environments_when_repeating=false`{.nowrap}.
+
+You can also specify the repeat count by setting the `GTEST_REPEAT` environment
+variable.
 
 ### Shuffling the Tests