Fix number of examples

Four examples are given but the comments refer to 3
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Grant Regimbal 2020-01-31 23:51:23 -06:00 committed by GitHub
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@ -1,5 +1,5 @@
// `for` is Go's only looping construct. Here are
// three basic types of `for` loops.
// four basic types of `for` loops.
package main