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Add note on illegal global variable names

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Original file line number	Diff line number	Diff line change
`@@ -151,6 +151,15 @@ Be careful, if you do something like this you'll change your global console inst`
`151`	`151`	`myModule.__set__("console.log",function () {/* be quiet*/ });`
`152`	`152`	```
`153`	`153`
	`154`	`+Globals with invalid variable names<br>`
	`155`	+rewire imports global variables into the local scope by prepending a list of`var` declarations:
	`156`	`+`
	`157`	+```javascript
	`158`	`+var someGlobalVar=global.someGlobalVar;`
	`159`	+```
	`160`	`+`
	`161`	+If`someGlobalVar` is not a valid variable name, rewire just ignores it.In this case you're not able to override the global variable locally.
	`162`	`+`
`154`	`163`	`<br />`
`155`	`164`
`156`	`165`	`API`

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