Docs: Fix typo in platforms-intro.md
absense -> absence
Closes
@@ -375,7 +375,7 @@ migration):
--cpu=... --crosstool_top=...`
This has some maintenance cost (you have to manually make sure the settings
- match). But this should work in the absense of renegade
+ match). But this should work in the absence of renegade
[transitions](#transitions).
1. Write [platform mappings](#platform-mappings) to support both styles by
