wifi_test_utils.py: Unclear function description.

Updated the docstring of the function. The function does not have a
return value. 'asserts' should take care of the failure

Bug: 31807632
Test: All acts/tests/google/wifi/ scripts that depend on this change
Change-Id: I4a6e3cdd53d17d95b2c2f7018f838475145ee852
diff --git a/acts/framework/acts/test_utils/wifi/wifi_test_utils.py b/acts/framework/acts/test_utils/wifi/wifi_test_utils.py
index e70bbfc..7956e91 100755
--- a/acts/framework/acts/test_utils/wifi/wifi_test_utils.py
+++ b/acts/framework/acts/test_utils/wifi/wifi_test_utils.py
@@ -683,7 +683,7 @@
             WifiEnums.WIFI_CONFIG_APBAND_2G or WifiEnums.WIFI_CONFIG_APBAND_5G.
 
     Returns:
-        True if soft AP was started successfully, False otherwise.
+        No return value. Error checks in this function will raise test failure signals
     """
     config = {WifiEnums.SSID_KEY: ssid}
     if password: