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SketchBookkeepermichalsnik

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Update no-side-effects-in-computed-properties.md (#480)

Provide more details on working with arrays inside computed properties.

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Original file line number	Diff line number	Diff line change
`@@ -16,7 +16,7 @@ computed: {`
`16`	`16`	return `${this.firstName} ${this.lastName}`
`17`	`17`	`},`
`18`	`18`	`reversedArray () {`
`19`		`- return this.array.reverse() // <- side effect`
	`19`	`+ return this.array.reverse() // <- side effect - orginal array is being mutated`
`20`	`20`	`}`
`21`	`21`	`}`
`22`	`22`	```
`@@ -29,7 +29,7 @@ computed: {`
`29`	`29`	return `${this.firstName} ${this.lastName}`
`30`	`30`	`},`
`31`	`31`	`reversedArray () {`
`32`		`- return this.array.slice(0).reverse()`
	`32`	`+ return this.array.slice(0).reverse()// .slice makes a copy of the array, instead of mutating the orginal`
`33`	`33`	`}`
`34`	`34`	`}`
`35`	`35`	```

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