Update language to comply with Android’s inclusive language guidance

See https://source.android.com/setup/contribute/respectful-code for reference

 #inclusivefixit

Bug: 161896447
Test: N/A
Change-Id: I9fd970726d739da658f6419a1ccd3e4952b17c78

tools/releasetools/apex_utils.py

@@ -273,7 +273,7 @@ def ParseApexPayloadInfo(avbtool, payload_path):
     else:
       payload_info[key] = value
 
-  # Sanity check.
+  # Validation check.
   for key in ('Algorithm', 'Salt', 'apex.key', 'Hash Algorithm'):
     if key not in payload_info:
       raise ApexInfoError(