Update language to comply with Android's inclusive language guidance am: aff51c2ceb am: b95926d836 am: de24c4025d

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/1376397

Change-Id: If42695c53fa4080c10863b1b8d5bbbe5d52526dd
diff --git a/omaha_request_params.cc b/omaha_request_params.cc
index d4b8d64..8a2e3dc 100644
--- a/omaha_request_params.cc
+++ b/omaha_request_params.cc
@@ -66,7 +66,7 @@
   image_props_ = LoadImageProperties(system_state_);
   mutable_image_props_ = LoadMutableImageProperties(system_state_);
 
-  // Sanity check the channel names.
+  // Validation check the channel names.
   if (!IsValidChannel(image_props_.current_channel))
     image_props_.current_channel = "stable-channel";
   if (!IsValidChannel(mutable_image_props_.target_channel))