Merge pull request #187 from dflogeras/linux-bootstrap-4-fix

Fix typo

Booting/linux-bootstrap-4.md

@@ -216,7 +216,7 @@ no_longmode:
 	jmp     1b
 ```
 
-We set stack, cheked CPU and now can move on the next step.
+We set stack, checked CPU and now can move on the next step.
 
 Calculate relocation address
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