docs(guide/Migrating from Previous Versions): fix typo "indentifiers"
Closes #15871
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Martin Staffa
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@@ -1296,7 +1296,7 @@ Due to [b71d7c3f](https://github.com/angular/angular.js/commit/b71d7c3f3c04e65b0
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falsy values (`''`, `0`, `false` and `null`) are properly recognized as option group identifiers for
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options passed to `ngOptions`. Previously, all of these values were ignored and the option was not
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assigned to any group. `undefined` is still interpreted as "no group".
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If you have options with falsy group indentifiers that should still not be assigned to any group,
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If you have options with falsy group identifiers that should still not be assigned to any group,
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then you must filter the values before passing them to `ngOptions`, converting falsy values to
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`undefined`.
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