Merge pull request #1014 from dr-acc/fix_typo

Corrected spelling of word 'tolerance'

reading/supervisors.livemd

@@ -105,7 +105,7 @@ The same is true if we manually exit a process using [Process.exit/2](https://he
 # Process.exit(pid, :exit)
 ```
 
-If you would like to learn more about fault taulerance and error handling, Joe Armstrong created an incredible video on the subject.
+If you would like to learn more about fault tolerance and error handling, Joe Armstrong created an incredible video on the subject.
 
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