Update shell_completions.md (#1907)
align documentation with the code : completions.go:452
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		@ -162,16 +162,7 @@ cmd := &cobra.Command{
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}
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					}
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```
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					```
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The aliases are not shown to the user on tab completion, but they are accepted as valid nouns by
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					The aliases are shown to the user on tab completion only if no completions were found within sub-commands or `ValidArgs`.
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the completion algorithm if entered manually, e.g. in:
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```bash
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$ kubectl get rc [tab][tab]
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backend        frontend       database
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```
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Note that without declaring `rc` as an alias, the completion algorithm would not know to show the list of
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replication controllers following `rc`.
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### Dynamic completion of nouns
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					### Dynamic completion of nouns
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