Fix PrintErrln and PrintErrf to behave like PrintErr

[jhahn21]

PrintErrln() and PrintErrf() prints to OutOrStderr while
PrintErr() prints to ErrOrStderr().

This PR fixes PrintErrln and PrintErrf to work like PrintErr.

[CLAassistant]

All committers have signed the CLA.

[amdprophet]

I believe this is a dupe of #894.

[github-actions]

This PR is being marked as stale due to a long period of inactivity

[alessio]

I believe this is fixed in #894

[umarcor]

@jpmcb, as commented by @alessio and @amdprophet, this was fixed in #894:

cobra/command.go

Lines 1225 to 1233 in 9a43267

	// PrintErrln is a convenience method to Println to the defined Err output, fallback to Stderr if not set.
	func (c *Command) PrintErrln(i ...interface{}) {
	c.PrintErr(fmt.Sprintln(i...))
	}
	// PrintErrf is a convenience method to Printf to the defined Err output, fallback to Stderr if not set.
	func (c *Command) PrintErrf(format string, i ...interface{}) {
	c.PrintErr(fmt.Sprintf(format, i...))
	}

.

This PR can be closed.

[jpmcb]

Thanks @umarcor - always appreciate the help tidying up!