Update assertionFailureFunction.md

Author: DeveloperTryingToCodeLikeOtherOfThem

docs/developers/core/assertionFailureFunction.md

@@ -1,13 +1,13 @@
 ## Assert Failure Function
-The assertion failure function is a function that checks if the condition is true.
-The function is **not** exported in any PXT platform, instead you have to use a shim to access
+The assertion failure function checks if the condition is true.
+The function is **not** exposed in any PXT platform, instead use a shim to access
 this function.
 
 Here is the shim path.
 
 `//% shim=pxt::getThrownValue`
 
-There is a `control.assert` function, but it is too high level and different compared to this function.
+There is a `control.assert` function, but it is different and more limited compared to this function.
 
 Here is a snippet showing it correctly.