Update and rename docs/throwFunction.md to docs/developers/core/throwFunction.md

Remove comments.

Author: DeveloperTryingToCodeLikeOtherOfThem

docs/developers/core/throwFunction.md

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+## Throw function
+
+The throw function throws a value written in the problems pane, similar to the throw syntax. 
+```
+ pxt.throwValue(null);
+```
+
+The difference is that the function is the core of the syntax in the MakeCode environment.
+
+Here is the shim for getting the function.
+
+`//% shim=pxt::throwValue`