doc: ctc -> tsc in onboarding extras

PR-URL: #15621
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Yuta Hiroto <[email protected]>
Reviewed-By: Rich Trott <[email protected]>
Reviewed-By: Khaidi Chu <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>

Author: bengl

doc/onboarding-extras.md

@@ -39,7 +39,7 @@
 | upgrading npm | @fishrock123, @MylesBorins |
 | upgrading V8 | @nodejs/v8, @nodejs/post-mortem |
 
-When things need extra attention, are controversial, or `semver-major`: @nodejs/ctc
+When things need extra attention, are controversial, or `semver-major`: @nodejs/tsc
 
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