Update the documentation to reflect deprecation of "external" profile value in `istioctl`

[devleejb]

What type of PR is this?

/kind documentation

What this PR does / why we need it: This PR updates the documentation to reflect the deprecation of the "external" profile value in istioctl and its replacement with "remote" to align with the latest changes.

Which issue(s) this PR fixes: Fixes #

Special notes for your reviewer:

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[devleejb]

@windsonsea Sorry, I don't understand. Could you explain with some screenshots?