ADD TO: fix spelling

Author: jrfnl

wiki/Version-4.0-Developer-Upgrade-Guide.md

@@ -122,10 +122,10 @@ Type casting for sniff property values set from within a ruleset has been made m
 
 Search for sniff which have `public` properties which can be changed from within a ruleset.
 
-* If the sniff has work-arounds in place to handle non-lowercase string `'true'` or `'false'` values for boolean properties, those work-arounds can be removed.
-* If the sniff has work-arounds in place to handle (any case) string `'null'` values, those work-arounds can be removed.
+* If the sniff has workarounds in place to handle non-lowercase string `'true'` or `'false'` values for boolean properties, those workarounds can be removed.
+* If the sniff has workarounds in place to handle (any case) string `'null'` values, those workarounds can be removed.
 * If the sniff explicitly expects only string values for array elements, the sniff may need to be updated.
-* If the sniff has work-arounds in place to handle the type casting of `true`, `false` and/or `null` for array elements, those work-arounds can be removed.
+* If the sniff has workarounds in place to handle the type casting of `true`, `false` and/or `null` for array elements, those workarounds can be removed.
 
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